InDetOverlay → InDetDetDescr Relation

File in InnerDetector/InDetRawAlgs/InDetOverlay	Includes file in InnerDetector/InDetDetDescr
src / SCTOverlay.cxx	InDetIdentifier / InDetIdentifier / SCT_ID.h
src / TRTOverlay.cxx	InDetIdentifier / InDetIdentifier / TRT_ID.h