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

gone for good.

* Fixes #85

back to the libcucul merge.

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.

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

behaviour.

http://libcaca.zoy.org/manual/libcaca-ruby.html).

* Add an empty doxygen.css file.

accordingly

such as "man tutorial" showing the libcaca tutorial on Debian systems.

the Doxygen documentation.

of --plugin-libs from it. The option is still here but does the same as
    --libs.