=head1 HISTORY
=head2 1999-05-06 v2.5 (Heiko Oberdiek)
* New options: --hires, --exact, --filter, --help.
* Many cosmetics: title, usage, ...
* New code for debug, warning, error
* Detecting of cygwin perl
* Scanning for %%{Hires,Exact,}BoundingBox.
* Scanning only the header in order not to get a wrong
BoundingBox of an included file.
* (atend) supported.
* uses strict; (earlier error detecting).
* changed first comment from '%!PS' to '%!';
* corrected (atend) pattern: '\s*\(atend\)'
* using of $bbxpat in all BoundingBox cases,
correct the first white space to '...Box:\s*$bb...'
* corrected first line (one line instead of two before 'if 0;';
=head2 2000-11-05 v2.6 (Heiko Oberdiek)
* %%HiresBoundingBox corrected to %%HiResBoundingBox
=head2 2001-03-05 v2.7 (Heiko Oberdiek)
* Newline before grestore for the case that there is no
whitespace at the end of the eps file.
=head2 2003-02-02 v2.70p (Péter Szabó)
* option --below
* removes DOS EPSF binary junk correctly
* adds all 3 BoundingBox DSC comments
* reads all 3 BoundingBox DSC comments, and picks the best
* forces BoundingBox to be an integer
* adds %%EndComments and proper %!PS-Adobe-?-? EPSF-?.? header
* adds %%Pages:
* adds invocation syntax: a2ping <infile.eps> <outfile.eps|pdf>
* can convert PDF to EPS (by calling pdftops(1)) and PDF to PDF
* emulates work for PDF input
=head2 2003-04-16 (Péter Szabó)
* added PS and sam2p support, renamed to a2ping
* sam2p and pdftops if $InputFilename eq '-';
* remove PJL UEL header from the beginning
* works for PS non-EPS files for input
* input support for PNG JPEG TIFF PNM BMP GIF LBM XPM PCX TGA via sam2p
* removes ^L (form feed) from end of EPS file
* -x=-c:rle to add sam2p options
=head2 2003-04-26 (Péter Szabó)
* omit the unnecessary setpagedevice calls when creating normal eps
* --noverbose --nocompress supported differently
* no more option defaults :-(
* justlib2
* multi-page output with PS:, PDF:, PCL5:
* after `a2ping -pa4', file out.pcl says: `HP PCL printer data - A4 page
size', instead of `US letter'
* justlib2-ified doesn't depend on Getopt::Long anymore
* fully supports filtering (stdin and/or stdout), PDF and PCL5 output to
pipe (!$$ll_zero)
* adds DSC ``%%DocumentMedia: plain 612 792 0 () ()''
* BoundingBox precedence for EPS input: --PageSize, %%*BoundingBox,
setpagedevice. Precedence for other inputs: --PageSize, setpagedevice,
%%*BoundingBox
=head2 2003-09-25 (Péter Szabó)
* --bboxfrom=adsc: %%BoundingBox overrides -sDEVICE=bbox
* improved bbox discovery
* many bugfixes
* MetaPost EPS input fixes for prologues:=0;
* a2ping.pl -v --papersize=50,60 --bboxfrom=compute-gs t.ps t2.ps
* consistent bbox, --PageSize, /PageSize handling
* consistent --Resolution and --Duplex handling
=head2 2003-12-02 (Péter Szabó)
* --bboxfrom=compute-gs option to fix PS -> EPS bbox (gs -sDEVICE=bbox), tuzv.eps
=head2 2004-02-10 v2.76p (Péter Szabó)
* This is the first version to be (retroactively) added to the Git repo.
* the compute-pipe routine is now run unless --bboxfrom=guess with EPS
* added --gsextra=
* added --antialias=
* added FileFormat PBM, PGM, PPM
* separated FileFormat features to FL_* constants
* added --doc
* there is no default FileFormat (PDF) anymore
=head2 200?-??-?? v2.77p (Péter Szabó)
* Almost identical to v2.81p.
* Almost identical to the /usr/bin/a2ping in TeX Live 2013, Ubuntu package
https://packages.ubuntu.com/trusty/texlive-extra-utils
2013.20140215-2 . /usr/bin/a2ping has the version number 2.77 in it.
=head2 200?-??-?? v2.78p (Péter Szabó)
* Almost identical to v2.82p.
* Has been available in http://www.inf.bme.hu/~pts/a2ping-latest.zip and
then in http://pts.50.hu/a2ping-latest.zip between 2007-03-07 and
2018-03-06.
* Has been published to http://freshmeat.sourceforge.net/projects/a2ping .
=head2 2004-04-28 v2.80p (Péter Szabó)
* Added reporting of the license (GPL).
* Some more improvements, no history text.
=head2 2006-11-15 v2.81p (Péter Szabó)
* Almost identical to v2.77p.
* Added keepoldmediabox.
* Lots of improvements, no history text.
* Almost identical to the /usr/bin/a2ping in TeX Live 2013, Ubuntu package
https://packages.ubuntu.com/trusty/texlive-extra-utils
2013.20140215-2 . /usr/bin/a2ping has the version number 2.77 in it.
=head2 2007-03-07 v2.82p (Péter Szabó and Frank Küster)
* Almost identical to v2.78p.
* Improvements for tetex2 and tetex3 compatibility.
* Some more improvements, no history text.
* POD documentation enhancements (font embedding tricks) by Frank Küster
* Has been available in http://www.inf.bme.hu/~pts/a2ping-latest.zip and
then in http://pts.50.hu/~pts/a2ping-latest.zip between 2007-03-07 and
2018-03-06, with the version number 2.78p in the a2ping.pl file.
* Has been published to http://freshmeat.sourceforge.net/projects/a2ping
with version number 2.78p.
=head2 2018-03-07 v2.83p (Péter Szabó)
* .callbeginpage and .setglobal fix for Ghostscript 9.22
(https://bugs.ghostscript.com/show_bug.cgi?id=699063).
Problem reported by Akira Yokosawa.
=head2 2019-11-17 v2.84p (Péter Szabó and Akira Yokosawa)
* -dNOSAFER fix for Ghostscript 9.50 by Akira Yokosawa.
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