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

and background colours to clear the screen.

cucul_import_canvas().
  * Renamed cucul_create_export() into cucul_export_canvas() for consistency.

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.

cucul.c just in case.