Update all package using MASTER_REPOSITORY_OPENROBOTS so that they now use
MASTER_REPOSITORY_OPENROBOTS_TRAC. This is to account for the upcoming
git.openrobots.org migration.

All packages not defining USE_LANGUAGE were relying on the default "c"
value. This commit explicits the dependency on a C compiler.

replaces http:// with git:// by default

laaswm-gui is a PyGTK interface to remotely control the LAAS windows manager