* Renamed cucul_*_canvas_frame() to cucul_*_frame() because we bloody well
    know that a frame belongs to a canvas.

* Partial update of the C++ bindings.
  * Updated documentation.

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M    cxx/cucul++.cpp
A    cxx/cxxtest.cpp
M    cxx/cucul++.h
M    cxx/Makefile.am

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.c just in case.