TrackBase & HitPattern redisign discussed on the RECO meeting of 08/05/2014

Documentation about the changes:
* https://twiki.cern.ch/twiki/bin/viewauth/CMS/TrackingHitPatternRedesign
* https://indico.cern.ch/event/317592/session/4/contribution/18/material/slides/0.pdf

The Backward compatibility issue presented on the slides is solved.