Changed class statics to const member data to fix thread-safety issues

The thread-safety checker complained about the non-const statics which
were being used to hold configuration information. These were easily
changed to const member data instead.
Fixed merge conflicts

Similar changes where already done to fix the statics. However,
I prefer this solutions since I was able to make the member data
const which more clearly states their purpose.
Merge pull request #1193 from Dr15Jones/fixStaticsRecoLocalMuonDTRecHit

Multithreading fixes -- Changed class statics to const member data to fix thread-safety issues