* Synchronise parameter types in the C++ bindings with the C API.

* Use size_t and ssize_t where appropriate.

completely breaks compatibility with previous versions of libcaca on
    64-bit systems.

<cucul.h> will provide the C99 types, even if libcaca has been installed.
  * Rename what's left of "common.h" to "stubs.h".
  * Remove all references to erroneous <inttypes.h> from source files.

major/minor computation scheme.

fewer than Firefox, lol.

accordingly.
  * The C++ test example no longer needs "config.h".

we don’t end with those ugly identifiers in the documentation.

* 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.

--This line, and those below, will be ignored--

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

from an alternate directory (they failed to find common.h).