TrkExSTEP_Propagator → MagneticField Relation

File in Tracking/TrkExtrapolation/TrkExSTEP_Propagator	Includes file in MagneticField
TrkExSTEP_Propagator / STEP_Propagator.h	MagFieldConditions / MagFieldConditions / AtlasFieldCacheCondObj.h
TrkExSTEP_Propagator / STEP_Propagator.h	MagFieldElements / MagFieldElements / AtlasFieldCache.h