Add EL-6 compatibility and %check section
    
    - Require python-genshi >= 0.6 or python-genshi06 as per trac itself
    - Go to great trouble to set %lang on translations
    - Help setup.py find Genshi 0.6, which is in an egg for EPEL-6
    - Add %check section and run test suite
    - Patch out errors in test suite
    - BR: trac for trac.test, needed for test suite