This fixes the path to source files in some unit tests and allows
to get rid of a few duplicate lines.

gone for good.

migration.

shell that doesn't look for sourced files in $PWD.

rely on .la files for library dependencies.

split is rendered moot by the plugin system: when enabled, binaries do
not link directly with libX11 or libGL. I hope this is a step towards
more consisteny and clarity.

<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.

--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).

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

<cucul.h> and <caca.h> headers.