Fixes ticket #51.

split is rendered moot by the plugin system: when enabled, binaries do
not link directly with libX11 or libGL. I hope this is a step towards
more consisteny and clarity.

<cucul.h> will provide the C99 types, even if libcaca has been installed.
  * Rename what's left of "common.h" to "stubs.h".
  * Remove all references to erroneous <inttypes.h> from source files.

without using environment variables..
  * Implement caca_get_display_driver() to return the current display's
    output driver.
  * Add a simple example program to test caca_create_display_with_driver().

* Autodetect zzuf in the configure step. It might become handy.

* Added back -Wshadow, it's more useful than annoying.

the automake "all" rule.

cacademo and cacafire, and displays them in a canvas.

* Add a test for fullwidth characters.

stuff, it's cool but it's crap.

test for the <caca0.h> emulation layer.

which case it is massively useless.

from an alternate directory (they failed to find common.h).

* Added a test for textfile loading.

contain development tools that are only useful to libcaca developers.

onto the other with an optional mask.

* Bitmap gamma test example. Of       ,---.        /""`_,'
    course it does not work yet,        |    `\``""-;   /
    because some dirty old pig          \   /`\\     ';'
    implemented a cucul_powf()        .')   |     __   \
    function that only works         / (`  /     /(O\. _|
    with integer exponents.       .-`|  `"`      `    .-\_
                               .-'   \                  ` ;=-.
    HAHAHAHA MAIS            .'        .           ._,   / o o\
    VIEUX PORC !         .-'`            .           '-._;_._.J
                     .-'`                               `.-'` 
                 _. -`         L            '          .'
               .'           U                  '- ._.-'
             /`          C                         /
            /         y                           |
      ._   ;       J                         |    |
       )).-|                     |           |    /
      (/`.-|                \    \           /  .;
      ( (_)|                 |    \         ; .' |
       '--';                 |    `\       / /   |
            \                |      `\    /.'   /
             \               /        ;  |`\   |
              '.           .'      _.-|  |  |  |
                '-.     .-';_"---'`.__|  |  |  \
                   `'-._     ``'-.    |  \  \__\\
                        `''--.___\\   \__\\

good to have something to start with.

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.

+ Extracted the colour test from examples/demo.c.

+ Win32 cross-compilation script.

+ Small event lister, similar to X11's xev.
  * src/graphics.c:
    + If possible, disable autorepeat in the X11 driver.
  * src/io.c:
    + Implemented CACA_EVENT_MOUSE_RELEASE in all drivers.
    + Button number support in CACA_EVENT_MOUSE_{PRESS,RELEASE}.

+ Moved spritedit to the test/ directory, because it is not mature enough.
  * libcaca.spec debian/control debian/rules:
    + Do not install caca-spritedit.

+ Trivial saturation/value rendering test.

+ Optimised S-Lang palette generator.
  * src/graphics:
    + Removed the S-Lang palette generator and replaced it with the tables
      generated by optipal.