skeleton of a tutorial for Jylam.

documentation page from caca.h to a separate file.

NOTES to tools/optipal.c.

* Removed most code from the raw driver and replaced it with a call to the
    caca exporter.
  * Slightly changed the caca export format and updated code accordingly.
  * Improved cacaserver error reporting.

now x/y/width/height instead of x1/y1/x2/y2. Avoids unnecessary +1/-1
    computations.

values between 0 and 9 (used to be 0 and 10). Updated documentation
    accordingly.

choose the background colour.

their name, eg. cucul_create() -> cucul_create_canvas() etc.
  * Moved buffer-related functions to cucul/buffer.c.

* Renamed canvas handle variables from "c" to "cv". Eh ouais mon gros.

<cucul.h> and <caca.h> headers.

same and they're very short (50-100 lines).

compilation warnings.

cucul.c just in case.

list of available formats. Also added a few truecolor blocks to the test.

* Added cucul_set_truecolor() for non-ANSI colours.
  * Added new argb32 -> rgb12 conversion functions.

such as cucul_dither_t instead of struct cucul_dither.
  * Made cucul_buffer_t an opaque structure and implemented the two getters
    cucul_get_buffer_data() and cucul_get_buffer_size().
  * Documented all missing functions and function parameters.