%% `edtable.sty'---Uwe Lück, direction Christian Tapp.
%% LaTeX package for tables with line numbers and
%% editorial notes.
%%
%% Copyright (C) 2003-2005 Uwe Lück
%%
\def\fileversion{1.3c} \def\filedate{2005/10/03}
%%
%% This file can be redistributed and/or modified under
%% the terms of the LaTeX Project Public License; either
%% version 1.3 of the License, or any later version.
%% The latest version of this license is in
%%   http://www.latex-project.org/lppl.txt
%% We did our best to help you, but there is NO WARRANTY.
%%
%% Please send your comments via
%%
%%   https://github.com/latex-lineno/lineno
%%
%% * USAGE: *
%
% *Requirements/overview:*
%
% The package is made for the background of the LaTeX2e macro
% package and enhances functionality of the following packages:
% 1.) Stephan I. B"ottcher's `lineno.sty' for printing line
%     numbers in the margin and a \label version \linelabel
%     relating labels to line numbers;
% 2.) our `ednotes.sty' for indicating variant readings and
%     other editorial remarks in separate footnote apparatuses;
% 3.) David Carlisle's `longtable.sty' for multi-page tables.
%                                                 %% TODO: supertabular etc.!?
% 4.) our `ltabptch.sty' for a patch of `longtable.sty'
%     (i.e., optionally, see below).
%
% Actually, only the first package is necessary for using the
% present one. The present one needs your line numbering commands
% according to the first one and its documentation to which we
% refer here. We likewise refer to the remaining packages for the
% details of their functionality.
%
% `lineno.sty' version 4.1 and (in case it is used) `ednotes.sty'
% version 0.8 (onwards) are needed. For obtaining recent versions
% of required packages, see the CTAN folder
%     /macros/latex/contrib/ednotes.
%
% *Install/load:*
% 1.) To be used, the present file must be put into a folder
%     that (La)TeX searches. You should have obtained a file
%     containing more detailed hints about this.
% 2.) We recommend loading this file *not* by
%     \usepackage[<options>]{edtable} but by loading `lineno.sty'
%     or `ednotes.sty' with package option `edtable'.
% 3.) To use the package options `longtable' and
%     `nolongtablepatch' that are described below, enter them
%     as options for `lineno.sty' or `ednotes.sty'.
%
% *User Commands:*
%
% 1. The package defines an environment `edtable' -- for its
% syntax we consider two cases:
% (a) Let <stdtable> be a tabular environment "like `tabular'".
% "Like" here means: (i) we have tested it with `tabular', but
% it should work with many more (e.g., from the `array' and
% `tabularx' packages) -- which share certain properties of
% implementation and requirements. Sorry, you must try, or we
% hope you will (and tell us). (For wizards: <stdtable> may
% probably be anything using a single \halign and \tabskip=0pt.)
% Definitively:
% (ii) LaTeX's standard `array' and other environments are *not*
% "like" `tabular'. Namely, environments that work only in math
% mode are not meant here. They are considered below in `b.'.
% (iii) `longtable' from the `longtable' package of the `tools'
% bundle neither is meant. An option of the present package
% deals with it as described below. Neither `supertabular' is
% meant.
% (iv) In general, usage with tabular environments that can
% break across pages as in (iii) is not recommended, at least
% when working with `ednotes.sty'. Even if some worked here, a
% shortcoming with `ednotes.sty' would be that the footnotes can
% appear on bad pages.
% -- Now the syntax is:
%    \begin{edtable}{<stdtable>}<args><entries>\end{edtable}
% -- where <args> and <entries> are usual arguments and entries
% for <stdtable>. So an example is:
%    \begin{edtable}{tabular}{cc}
%      left upper & right upper \\ left lower & right lower
%    \end{edtable}
% This produces just what <stdtable> does in an extra line,
% only adding line numbers in the margin and processing `ednotes'
% commands in the entries appropriately.
% (b) Let <stdarray> be an "array environment" like -- standard
% LaTeX's `array'! "Like" here means (i) ... analogously to
% <stdtable> above. (ii) "Text" ... oh, sorry, this is not clear
% to me at present, and I am in a hurry.                 %% TODO
% (iii) Nothing from the `amsmath' package seems to work here,
% sorry, I have tried a lot ... (iv) For standard LaTeX's
% `eqnarray', it is better to try the `linenomath' environment
% of `lineno.sty' [with package option `mathlines']. Its
% modifications in `amsmath' produce (at best) a spurious line
% number with the `linenomath' environment (up to now).
% -- Now the syntax is:
%    \begin{edtable}[<$$$>]{<stdarray>}
%      <args><entries>\end{edtable}
% -- where <args> and <entries> are usual arguments and entries
% for <stdarray>. <$$$> can be one of `$' or `$$'. Indeed, the
% <stdtable> syntax above (without [<$$$>]) *does not work*
% inside $...$ or $$...$$. -- An example:
%    \begin{edtable}[$$]{array}{cc}
%      a_{11} & a_{12} \\ a_{21} & a_{22}
%    \end{edtable}
% Now, this produces just what <stdarray> does in an extra line
% etc. as with <stdtable>. However, \linelabel and `ednotes.sty'
% footnotes may need the `mathrefs' option of `lineno.sty'. For
% the difference between `[$]' and `[$$]', see below.
%
% 2. When working with `ednotes.sty', in
%   \Anote{L1\<L2\>L3}{NOTE}
% L2 may contain &'s and \\'s, but L1, L3 must not! Analogously
% for \Bnote, etc., \Anotelabel...\donote..., etc. -- Well this
% holds for <stdtable>, hardly for <stdarray> ...        %% TODO
%
% 3. On positioning: You may have wondered about `extra line'
% above. This means that `edtable' starts a new line at
% \begin{edtable} and at \end{edtable}.          %% TODO: sure!?
% (a) It should be placed within a `center', `flushleft', or
% `flushright' environment for proper (vertical) spacing, but
% also works without. However, with <stdarray> and optional
% parameter `$$' of `edtable' (i.e., \begin{edtable}[$$]...),
% you can obtain the usual math display spacing *within a
% paragraph*; especially, the vertical space is less when the
% previous line is short ... and so on.
% (b) Horizontal positioning of line numbers (usually) needs a
% second run (after changing a table)! %% TODO: automatic warning.
% (For wizards: It may fail if some of \leftskip, \rightskip,
% \linewidth, and \@totalleftmargin are used in an unusual way.)
% A <dimen> register \ETextraoffset is provided whose value is
% 0pt by default and which additionally moves line numbers
% to the left (right) if given a positive (negative) value.
%                                               %% TODO: any use?
%
% *Package options:*
%
% 1. Option `longtable' adjusts the `longtable' environment
% defined by David Carlisle's longtable.sty for use with
% `lineno.sty' and `ednotes.sty'. The option makes `longtable'
% environments appear with line numbers in the margin, according
% to `lineno.sty', and process `ednotes.sty' commands if line
% numbering is active according to `lineno.sty'.
% [We maintain an alternative package with just this function
% in a slightly different implementation.] %% -> ulnltab.sty.
% Lemmas may go across table entries as with `edtable' (see above).
% ---There might be options like `supertabular' for adjusting
% other tabular environments that cannot be handled by the
% `edtable' environment provided here---they have not been
% implemented yet!                                             %% TODO
%
% 2. Option `nolongtablepatch' avoids loading/asking for
% `ltabptch.sty'. I.e.: according to LaTeX bugs database,
% tools/3180 and tools/3485, there have been problems with
% vertical spacing around `longtable' environments. By default
% the present package loads our `ltabptch.sty' or asks for it.
% Option `nolongtablepatch' overrides this. This is useful when
% you don't want to have the patch, especially when you use an
% "emergency stop" installation of TeX.
%
% *Wizard interface:*
% Macros \@ET@makeLineNumber, \@ET@use@outerhook,
% \@ET@execute@outerhook, \@ET@ampnotes \@ET@startlinewith,
% \@ET@trivialize@linelabel are provided as tools for adjusting
% tabular environments for use with `lineno.sty' and
% `ednotes.sty'. \@ET@step@linenumber is \let \stepLineNumber
% (from `lineno.sty'), but could be used as a hook for
% something different. See Environment `edtable' and Option
% `longtable' below for examples of application.
%                                        %% TODO: specification here.
%
%
%% * Acknowledgements: *
%
% Stephan I. B"ottcher told us how to do it in extensive discussion
% and by providing some first code lines. We changed these essentially
% in some respects, but kept his general ideas and some parts of his
% macros, the latter even without knowing what we are doing.
%
% v1.3 is due to a request by Martin Brandenburg.
%
%  * Now for internals: *
%
\NeedsTeXFormat{LaTeX2e}[1994/12/01]
% 1994/12/01: \newenvironment* etc. %% TODO: more recent needed?
\ProvidesPackage{edtable}[\filedate\space v\fileversion\space
  arrays with lineno + ednotes (ul)]
%
% Alternative ideas for implementation:
% 1. There is a German package `TABMAC' enhancing `EDMAC' (cf.
% documentation of `ednotes.sty'). We could have rewritten its
% macros so it would work with `lineno.sty' and `ednotes.sty'
% in place of `EDMAC'. [TODO: "tabmac.sty"]
% 2. We redefine `longtable' by Option `longtable' because
% there seems to be only one reasonable use of the `longtable'
% environment in the course of a critical edition. This may be
% different for environments like `array' and `tabular' which
% can be used within text lines. Therefore, these environments
% are not redefined.
% 3. One might use \everycr, however: (a) it is executed
% before the first row, (b) it is executed in fake lines that
% `longtable' uses.
% 4. As an alternative to \everycr, there is the approach of
% redefining \cr and \crcr for setting \noalign. This needs
% redefining \@tabularcr etc.---not nice. We use this approach
% here for `longtable' which uses a stretching \tabskip.
% For \tabskip=0pt, we attach line numbers by a template.
%
% \RequirePackage{lineno}[2004/10/06]
% Wanted to check lineno version--causes unknown option error.
% See LaTeX bug latex/3730.

% Options:

%% TODO: underful page with `longtable.sty'!?
\let\if@ET@longtable\iffalse % \newif\if@ET@longtable@
\DeclareOption{longtable}{\let\if@ET@longtable\iftrue}
\let\if@ET@ltabptch\iftrue
\DeclareOption{nolongtablepatch}{\let\if@ET@ltabptch\iffalse}
\ProcessOptions

% Redefine \longtable if option:
\if@ET@longtable
  % Stephan's direction for attaching a line number to each row
  % is using \noalign in the course of \\.
  % However, (1) the user should not worry about closing the table
  % with \\ or without, and (2) the line number thing should not
  % happen twice if \\ is the last token before \end{longtable}.
  % Our solution: attach something to the beginning of \endlongtable
  % which attaches line number unless an unsucceeded \\ has done it.
  % This thing is activated by each row start and turned off by \\.
  % Since the switch at row start may happen to be in a pbox,
  % let it act globally on \endlongtable. (The \crcr at the beginning
  % of \endlongtable must not be changed directly, since original
  % \crcr may be required in table entries using \oalign etc.)
  %
  \RequirePackage{longtable}%
%   \IfFileExists{longtable.sty}{\RequirePackage{longtable}}%
%                               {\RequirePackage{longtabl}}%
% For Atari problem, it suffices to rename `longtable.sty'
% into `longtabl.sty'.
%
% Patch for tools/3180 and tools/3485 of LaTeX bug database:
 \if@ET@ltabptch
  \IfFileExists{ltabptch.sty}{\RequirePackage{ltabptch}}{%
    \PackageError{edtable}{%
      ltabptch.sty (for improving spacing around\MessageBreak
      longtable) missing! Be sure to use it always\MessageBreak
      or never!%
    }{%
      To omit ltabptch.sty *and* escape this error,\MessageBreak
      use package option `nolongtablepatch'.%
    }%
 }
 \fi
  \let\@ET@@longtable\longtable
  \def\longtable{%
    \ifLineNumbers
      \expandafter\@ET@longtable
    \else
      \let\@ET@sw@cr\@ET@crcr % ... in \endlongtable.
      \expandafter\@ET@@longtable
    \fi
  }
  \def\@ET@longtable{%
  % Since we have made it anyway, we use the method of redefining
  % \halign for inserting the activating row start as well.
  % However, redefinition must be repeated before every \LT@bchunk.
  % \longtable and \LT@get@withs are good places for this.
    \@ET@startlinewith\@ET@sw@cr@on
    \@ET@trivialize@linelabel
    \@ET@use@outerhook
    \@ET@ampnotes
    \let\LT@tabularcr\@ET@LT@tabularcr
    \expandafter\def\expandafter\LT@get@widths\expandafter
      {\LT@get@widths\@ET@startlinewith\@ET@sw@cr@on}
    % Admittedly, we could make it less of a hack by using @{...}
    % ---we could then leave \LT@get@widths untouched.
    \@ET@@longtable
  }
  \def\@ET@sw@cr@on{\global\let\@ET@sw@cr\@ET@cr@attach}
  % We are hacking a longtable version offering
  %   \def\LT@tabularcr{%
  %     \relax\iffalse{\fi\ifnum0=`}\fi
  %     \@ifstar
  %       {\def\crcr{\LT@crcr\noalign{\nobreak}}\let\cr\crcr
  %        \LT@t@bularcr}%
  %       {\LT@t@bularcr}}
  % We need a redefinition of \cr which is not overridden by \@ifstar:
  \def\@ET@LT@tabularcr{%
    \relax\iffalse{\fi\ifnum0=`}\fi
    \def\cr{\@ET@sw@cr}%
    % So \crcr is affected by change of \@ET@sw@cr, cf. below.
    \let\crcr\cr
    \@ifstar
      {\gdef\@ET@sw@nobreak{\nobreak
       \global\let\@ET@sw@nobreak\relax}%
  %     {\def\cr{\@ET@sw@cr\noalign{\nobreak}}\let\cr\crcr
  % Why didn't this work? %% TODO: try shorter again.
       \LT@t@bularcr}%
      \LT@t@bularcr
  %     {\let\cr\@ET@sw@cr \let\crcr\cr
  %      \LT@t@bularcr}% This accompanied \def\cr... above.
  }
  % Attach \@ET@sw@cr to beginning of \endlongtable:
  \expandafter\def\expandafter\endlongtable\expandafter
    {\expandafter\@ET@sw@cr\endlongtable}
  \def\@ET@cr@attach{% Actually attaching line numbers.
    \@ET@crcr\noalign{% Basically Stephan's approach.
  % If we were not careful, following box containing line number
  % could fool interline glue after longtable, even if tools/3485
  % is repaired in some way. This box should have same depth as
  % the line composed previously.
      \nobreak %% \@ET@ex... might cause page break. 2003/10/30.
      \setbox\z@\@ET@makeLineNumber
      \ht\z@-\prevdepth \dp\z@\prevdepth \box\z@
      \@ET@step@linenumber
      \global\let\@ET@sw@cr\@ET@crcr % ... if called by \\.
  % This also resets the \crcr starting \LT@echunk following
  % \@xargarraycr or \@yargarraycr in \LT@argtabularcr.
  % \let...\relax seems to suffice at well, but in case ...
      \@ET@execute@outerhook %% 2003/10/30.
      \@ET@sw@nobreak
%       \@ET@execute@outerhook
    }%
  }
  \let\@ET@crcr\crcr
  \global\let\@ET@sw@nobreak\relax % Just to remind ...
\fi

\let\@ET@step@linenumber\stepLineNumber
% \def\@ET@step@linenumber{\global\advance\c@linenumber\@ne}
\def\@ET@makeLineNumber{\hb@xt@\z@{\makeLineNumber}}
%% TODO: export to lineno.sty!?
% Special \halign:
% For `array' etc., we insert line numbers by a leftmost template.
% @{...} in the last argument of `array' etc. is difficult for this
% since `tabular*' has an additional argument. So we redefine
% \halign to put something to the right of the next \bgroup.
% Now, as a macro, \halign would break in an \edef or \xdef.
% Horribly, this danger has become quite real in longtable.sty's
% definition of \LT@bchunk. Only its latest version 4.10 has
% preceded \halign by a \noexpand (for mathtext.sty which
% redefines \halign as well). We need not rely on such a
% provision if we let \halign expand to \the<token register>
% for some token register. However, using \toks@ or \@temptokena
% is neither very safe---might be filled by macro ahead with
% something new. So reserve an own token register.
\newtoks\@ET@toks
\@ET@toks{\@ET@specialhalign}
% v1.3: In 'AMSmath', there are \halign's followed by explicit
% left braces. Thus '\def\@ET@specialhalign#1\bgroup{%' broke.
%% TODO ...
\def\@ET@specialhalign{%
  \ifmeasuring@ \expandafter\@firstoftwo
% v1.3 2005/03/04, for `amsmath'.
  \else \expandafter\@secondoftwo
  \fi
  {\let\halign\@ET@@halign \halign}%
  {\@ifnextchar\bgroup\@ET@replace@arg\@ET@sphalign@to}}
%% TODO: change back, commenting out code above, report
%%       error with `alignat'.
%   \@ifnextchar\bgroup\@ET@replace@arg\@ET@sphalign@to}
% If `amsmath' not loaded (v1.3):
\AtBeginDocument{\@ifundefined{measuring@true}{%
  \let\ifmeasuring@\iffalse}\relax}
\def\@ET@replace@arg#1{%
  \def\@EN@tempa{#1}\def\@EN@tempb{\bgroup}% Corr. after v1.3b.
  \ifx\@EN@tempa\@EN@tempb
    \def\@EN@tempa{\@ET@sphalign@to\bgroup}%
  \else
    \def\@EN@tempa{\@ET@sphalign@to{#1}}%
% This may be wrong, #1 might be `t' from `to' ...
  \fi
  \@EN@tempa}
\def\@ET@sphalign@to#1\bgroup{%
  \let\halign\@ET@@halign % Reset for nested arrays.
  \halign#1\bgroup
%  \ifmeasuring@\else % For `amsmath', moved backwards.
    \@ET@startline % [Wizard interface, via \@ET@starlinewith.]
%  \fi
}
% Wizard interface:
\def\@ET@startlinewith{% Next token precedes preamble.
%   \let\@ET@@halign\halign % Or \AtBeginDocument?
% ... indeed: bad loop with long longtable (\LT@get@widths!?)
  \def\halign{\the\@ET@toks}%
  \let\@ET@startline
}
\AtBeginDocument{\let\@ET@@halign\halign}
% Or save it at start of environment only
% (don't repeat inside longtable).
%
% Outer hook for inserts: (wizard interface)
\def\@ET@execute@outerhook{% To be placed outside inner mode.
  \@ET@outerhook \global\let\@ET@outerhook\@empty
}
\global\let\@ET@outerhook\@empty % Just to remind: global!
% \@EN@hookfn (ednotes) sends to outer hook:
\def\@ET@use@outerhook{% Wizard interface.
  \def\@EN@hookfn{\g@addto@macro\@ET@outerhook}%
}%% TODO: move last line to `ednotes', \let\@ET@use...\@empty.
%%        But this requires re-installing both packages
%%        at the same time. See the `ampnotes' thing as well.
%
% Trivialize \linelabel: (wizard interface)
\def\@ET@trivialize@linelabel{\let\linelabel\@ET@linelabel}
\def\@ET@linelabel{%
  \protected@edef\@currentlabel{\theLineNumber}%
  \label
}
% Change ampersand at \Anote etc.: (wizard interface)
%% 2003/10/31.
% & is changed by \Anote etc. No \begin...\endgroup,
% next \\ or & after % note/donote command switches back.
% ---Global change seems to break table setup.
\begingroup
\gdef\@ET@hideamps{\catcode`\&\active}
\@ET@hideamps
\gdef\@ET@ampnotes{%
  \let&\@ET@hideamp
  %% & would be undefined after \\ in lemma.
  \let\@ET@EN@rnote\@EN@note
  \def\@EN@note{\@ET@hideamps\@ET@EN@rnote}%
  \let\@ET@EN@rnotelb\@EN@notelabel
  \def\@EN@notelabel{\@ET@hideamps\@ET@EN@rnotelb}%
}
%% TODO: & and \\ in \@EN@lemmaexpands!?
\endgroup
\def\@ET@hideamp{&}

\newenvironment*{edtable}[2][]{%
% #1 $ or $$, #2 standard environment name.
%% TODO: star version!? cf. lineno.sty's `numquote'.
  \def\@ET@mode{#1}%
  \def\@ET@currenvir{#2}%
  \ifhmode \ifnum\the\lastpenalty=-\@M\else
% \par must be executed for printing/stopping line numbers:
    \@centercr\relax \noindent
  \fi \fi
  \ifvmode \noindent \fi % Otherwise linenumbers are indented
% -- however, not recommended.
  \@ET@use@outerhook
  \@ET@trivialize@linelabel
  \@ET@ampnotes
  \@ET@startlinewith\@ET@normal@startline
  \global\advance\c@linenumber\m@ne % Stepping correction.
% (Must come after closing previous paragraph.)
% Calculate offset:
  \global\advance\c@ET@array\@ne
% Saving/calling width of table (`longtable's algorithm).
% Test if there is \@flushglue on the left (center or flushleft):
  \edef\@EN@tempa{\the\@flushglue}%
% ... v1.3: fool this for "$$".
  \in@{$$}{#1\@nil}% \in@{#1}{#2} searches #1 in #2#1 ...
  \edef\@EN@tempb{\the\ifin@\@flushglue\else\leftskip\fi}%
  \ifx\@EN@tempa\@EN@tempb
% Assume \@ET@offset is 0pt else here.
    \@ET@offset\linewidth
    \advance\@ET@offset-%
      \@ifundefined\@ET@arraywidth@csn % Shortened for v1.3.
        {\linewidth\G@refundefinedtrue
         \PackageWarningNoLine{edtab}{^^JLine numbers at
           \@ET@currenvir\space need \jobname.aux}}%
        {\csname\@ET@arraywidth@csn\endcsname}%
% Test if \@flushglue on the right (center):
% ... v1.3: fool it again. Repeat \in@ in case ...
    \in@{$$}{#1\@nil}%
    \edef\@EN@tempb{\the\ifin@\@flushglue\else\rightskip\fi}%
    \ifx\@EN@tempa\@EN@tempb \divide\@ET@offset\tw@ \fi
  \fi
  \advance\@ET@offset\@totalleftmargin
  \advance\@ET@offset\ETextraoffset % Offset ready.
  \setbox\@tempboxa\hbox\bgroup
% v1.3: `alignat' complains later when this is \vbox instead.
%    \vbox\bgroup % Tried in vain.
    \ifx\@ET@mode\@empty\else $\fi
    \csname#2\endcsname
}{%
    \csname end\@ET@currenvir \endcsname
    \ifx\@ET@mode\@empty\else $\fi
  \egroup
  \@ET@step@linenumber % Stepping correction.
  \if@filesw
    \immediate\write\@auxout{%
      \gdef\expandafter\noexpand
        \csname\@ET@arraywidth@csn\endcsname
          {\the\wd\@tempboxa}}%
%% TODO: warning if changed!?
  \fi
% No automatic line number at array line:
  \nolinenumbers
  \@ET@mode\ensuremath{\vcenter{\box\@tempboxa}}\@ET@mode % v1.3.
  \@ET@execute@outerhook
  \ifhmode \@centercr\relax \fi
% \par must be executed for proper restart of printing line numbers
% (think so).
  \@endpetrue % Outside \@flushglue environment, avoid indent ahead.
%% TODO: slightly change for math mode around? Or give an error
%%       in math mode.
}
%% TODO: make \edtable \outer!?
\def\@ET@normal@startline{%
  \@ET@step@linenumber
  \llap{\@ET@makeLineNumber \hskip\@ET@offset}%
}
\newdimen\@ET@offset
\newdimen\ETextraoffset
%% TODO: export to lineno.sty!?
\newcount\c@ET@array
\def\@ET@arraywidth@csn{ET@a@\romannumeral\c@ET@array}
%
%% TODO: .dtx
\endinput

%% VERSION HISTORY:
v0.22 2003/01/13  First version, named `edtab02.sty', sent around,
                  together with ednotes.sty.
v0.23 2003/01/22  Added version history.
v0.24 2003/01/27  Copyright notice.
%%% v0.3  2003/03/03  Requires linenox0.sty. %% RETREATED
%% TODO: reconsider,  see `lineno[x].sty'.
v0.25 2003/03/05  Added <ednotes.sty@web.de>.
v0.26 2003/03/23  Added \@ET@startlinewith to wizard command list;
                  moved redefinition \LT@get@widths from option code
                  into \@ET@longtable so this really happens in
                  line number mode only; moved \let\@ET@@halign\halign
                  from \@ET@startlinewith to \AtBeginDocument.
v0.27 2003/06/02  Added \ifvmode \noindent \fi to `edtable' definition;
      2003/06/10  added `lemma cannot run' to instructions.
v0.28 2003/10/31  \@ET@cr@attach: moved \@ET@execu..., added \nobreak.
                  Added \@ET@ampnotes and documentation: now working
                  across entries.
v1.0  2004/05/13  `ednotes.sty' etc., updated copyright. Renamed as
                  `edtable.sty' for TUGboat article.
                  \RequirePackage{lineno}, changed doc. accordingly.
                  Removed `may be released under different name'.
v1.10 2004/07/27  Looking for `longtabl.sty' for my Atari!
      2004/08/22  Added warning (screen/documentation) concerning
                  ltabptch.sty.
      2004/08/23  Added suggestion of option `nolongtablepatch';
                  LPPL v1.3.
v1.2  2004/08/31  Rearranged preamble concerning maintenance,
                  removed `preliminary release'.
      2004/10/06  \newif -> \let...; option `nolongtablepatch';
                  changed documentation accordingly and for
                  loading edtable.sty by lineno/ednotes option;
                  \let\@ET@step@linenumber\stepLineNumber; use
                  \ifLineNumbers.
      2004/10/07  Needed version numbers.
      2004/10/08  ltabptch warning -> error!
      2004/10/11  Disabled \RequirePackage{lineno}[...]; undid
                  the `longtabl.sty' thing from 2004/07/27.
      2004/10/12  latex/3730.
v1.2a 2004/11/07  LPPL v1.3a.
v1.2b 2005/01/10  Contact via http.
v1.3b 2005/03/04  Support for environments like `array'
                  environment. The description of `edtable' was
                  wrong in this respect!
v1.3  2005/03/07  Adaptations in documentation, and extended usage
                  instructions very much, correcting some
                  errors as well. Acknowledgement to M. B.
v1.3a 2005/03/09  Corrected numbering in `usage'.
v1.3c 2005/03/15  \@centercr\relax, TODO on math mode.
      2005/04/09  `editory' -> `editorial'.
