Gladtex

- Try to parse LaTeX's error output and display it to help users to find the
issue quicker and to make GladTeX better embeddable.
- Add option to remove error log file, produced by LaTeX, automatically.
- Rewrite some help messages.
- Add signal handling to get meaningful error messages if GladTeX hangs.

- Add some eval's to cope with some failures.
- Since there were some incompatibilities between Perl 5.10 and 5.18 in how
the cache of the generated images is stored, GladTeX now removes this file
along with all images starting with "eqn" and generates them again.

- Remove desc.html if created and empty

(and disabled images)
- If requested (-a), exclude equations longer than 80 characters in an extra
file and make the equation image a link to the longer, excluded image
alternative
- eqn2img: patch to allow building on windows
- Change build system from make to cmake
- Refactored gladtex code a lot to allow the usage of "use strict/use
warnings"
- Fix bug where multiple equations couldn't be on a single (html) line
- Rework manpage

- Update man page with CSS class options
- Add support for setting the CSS class of images when the
environment is "math" or "displaymath"
- eqn2img: changed redirection syntax (from dvips to /dev/null)
for portability
- GladTeX: exit with status 1 when a closing EQ tag is missing
- GladTeX: print error messages to stderr instead of stdout
- Fix environment-passing to eqn2img
- Add support for a "dpi" attribute on EQ tags to customize the
DPI used for each equation

1.2 - Fixed a serious memory allocation error, pointed out by Eric J.
Francois. Also fixed several leaks.
- Added full alpha channel to PNG files (also suggested by Eric)
- The -e option was ignored, fixed (pointed out by Andr\'e Schleife)
- Added man page, contributed by Volker Schatz

(use "env" in the shebang line) and do not rely on the bash style
"&>" redirection.