building cacaserver.

* Started changing function prototypes so that they return an integer
    instead of void, just in case they might fail.

a nicer cross compilation check.

* Implement htons/htonl in common.h just in case.

in all .c files that needed it.

default for the release, because it's not up to date and needs a lot
    of polishing.

and background colours to clear the screen.

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

contain development tools that are only useful to libcaca developers.

expect).

* Use a custom pow() function for gamma computation.

in the SLang driver.
  * Cosmetic fixes in configure.ac.

as multiboot kernels.

if you do not want any.

* Renamed caca_refresh() into caca_display() which makes more sense.
  * Optimised gl_bgpal by directly storing floats instead of doing the
    conversion at runtime.
  * Handle resizing in cucul_set_size() and try to keep as much information
    as possible from the previous canvas.
  * Moved most global variables into cucul_t or caca_t contexts.
  * Moved time.c into libcaca.

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.

a future shared library.

+ Check for resize_term and resizeterm in -lncurses.

+ Check for curses.h as well as ncurses.h.
  * src/caca.c src/event.c src/graphics.c:
    + Include curses.h if ncurses.h was not found.

+ Resize handling in the ncurses and slang drivers.

+ Added --disable-doc to let the user not build documentation.
  * build-win32:
    + Do not build documentation.

+ Check for sys/times.h and unistd.h.
    + Added calls to AC_C_CONST and AC_C_INLINE.
  * src/time.c src/graphics.c:
    + Fixes for MSVC compilation warnings.
    + Additional sanity checks in the Win32 driver.
  * src/caca.c:
    + Use raw()/noraw() in the curses driver instead of cbreak().
  * msvc/libcaca.sln:
    + Added an MSVC solution.
  * examples/aafire.c:
    + Slightly reduced the maximum cacafire framerate.

+ Better win32 check for Sleep().