Adding MWPC code to the A2-Collaboration:master

The branch mushkarenkov:master contains the updated MWPC code (TA2CentralApparatus, TA2CylMwpc, etc.). It also has the event display and MWPC automatic calibration tool from Susanna. I think we could finally add all this stuff to the A2-Collaboration:master so many people could use and test it.