enforcing the internal localization to C using LC_ALL

To avoid problems with non-supported languages, we set the environment
variable LC_ALL to "C" at the beginning of gaudirun.py and GaudiPython.

To warn the user of the change, a message is printed unless LC_ALL is
already set to "C".

From: Marco Clemencic <marco.clemencic@cern.ch>


git-svn-id: file:///afs/cern.ch/work/b/binet/dev/repos/gaudi-svn-mirror/Gaudi/trunk/GaudiPython@7334 22b0f739-a4da-4a50-9948-337547c35a65