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.

in all .c files that needed it.

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