remove redundencies in the Doxygen documentation.

secure against broken files, but it probably needs peer review.

* Fixed font selection through cucul_font_load().
  * Added a bigger 10x19 bold font.

so that the font can be easily rebuilt.

* Removed ugly hooks from test/font.c.

* Documented most font functions.
  * Cleaned up cucul_render_canvas() and made it actually usable by external
    programs. Removed ugly printf() debug calls.

* Replaced the 8-bit internal font with a 4-bit one.

fg/bg value into its separate argb 4-bit fields.

for the moment.

skeleton for the renderer that will not last very long.

format proposal is in this file. Feel free to comment.

contain development tools that are only useful to libcaca developers.

factored common-image.c file. Feature selection such as antialiasing or
    dithering mode are still disabled.

name, but as I said, I do what I want. http://zoy.org/~sam/pb7th.png

* Removed '\x0f' from the IRC exporter until I understand why it was here.

really portable, and Visual Studio complains when they are not explicitely
    cast.

* Fixed exporter headers to make Doxygen happy.