Cleaning, Adjust verbosities, Make comments in sel xmls digestable

During the testing of the new genreflex and the study of the
selection rules emerged already.
Some work is still needed to have all the selection rules functional,
but this commit is needed to give more chance to the reflex free
Gaudi to work with root6 on the lcg nightly slot2.
Temporary twiki set up for the investigations of genreflex:
https://twiki.cern.ch/twiki/bin/view/Main/GenreflexRoot6