documentation page from caca.h to a separate file.

hyperlinks! Also, set compact LaTeX mode and a few other Doxygen options.

of unicode letters) is now separated from the higher level rendering and I/O
(that is, libcaca). This commit totally breaks the API, but once everything
is polished I will think about source-level backward compatibility. Most
drivers are broken, but X11 still sorta works.

  The new design is much more object-oriented and allows having several
active renderers at the same time, changing renderers on the fly, and more
important, having no renderer at all (useful for converters, or when you
want to do your own renderer).

  And in case you are still wondering, the libcucul acronym has "Unicode"
because I want to support at least a subset of Unicode. There are awesome
glyphs in it, including the ones inherited from Codepage 437 such as
"gray 25%" that are used in DOS and Win32 ANSI art.

+ Removed caca_internal.h from the list of documented files.
  * src/:
    + Minor documentation updates.

+ Added caca_wait_event(), a blocking caca_get_event().
  * src/ examples/:
    + More documentation.
  * doc/doxygen.cfg.in:
    + doc/doxygen.cfg is now generated by configure, so that we can use
      @top_srcdir@ and we no longer need to hardcode PROJECT_NUMBER.
    + Create manpages.

+ Updated long descriptions.
  * debian/changelog ChangeLog doc/doxygen.cfg NEWS:
    + Prepared 0.3 release.
  * README:
    + --enable-ncurses is now the default.

+ Added these mandatory files.
  * doc/:
    + Wrote a Doxygen configuration file.
    + Added a manpage for caca-config(1), borrowed from sdl-config.
  * configure.ac:
    + Use new style AC_INIT.
    + Error out if no library was found.
    + Added *djgpp* to the list of non-PIC platforms.
    + Added checks for doxygen and latex.