Changed Deflection_TBmagnet.cc so Tree_EnterMagnet and Tree_LeaveMagnet are used
included momentum vector in class SimCalorimeterHit
three TTrees for MCParticles and the two scintillator readouts
changed Circular_path function so that incoming angles are regarded
only using SimCaloHit TTrees, also for particle paths infront of the magnet -> change not completely finished yet
Program finished: now draws theta for e+/e-, calculated from path between first and second scintillator and z-axis
Merging three different TTrees in one file