built-in font so that we now cover all of CP437.

background.

a file and a memory area into a libcucul buffer.
  * Changed the cucul_import_canvas() prototype so that it uses libcucul
    buffers instead of simple memory areas.

sequences longer than 100 characters.
  * Documented the escape sequence format.

intermediate bytes.

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

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

in all .c files that needed it.

whether we want plain ASCII, UTF-8, or CP437.

it breaks on too many IRC clients.

and background colours to clear the screen.

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

skeleton of a tutorial for Jylam.