Setmass even if track mom is not there.
Cleanup and double32.
Reworked particle interface to cache FourVectorM
Added ObjType to retrieve type of object.
Cosmetics
Added TrackerTrk accessor to ChargedParticle and StableParticle
Cleanup
Have consistent Trk implementation.
comments
Renamed Lepton to ChargedParticle and added StableParticle class
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