Columnar → Generators Relation

File in PhysicsAnalysis/Columnar	Includes file in Generators
ColumnarCore / ColumnarCore / MomentumAccessors.h	TruthUtils / TruthUtils / ParticleConstants.h
ColumnarTracking / ColumnarTracking / TrackHelpers.h	TruthUtils / TruthUtils / ParticleConstants.h
ColumnarTestFixtures / Root / ColumnarPhysliteTest.cxx	TruthUtils / TruthUtils / ParticleConstants.h