dropped unused header MDF/RawEventHelpers.h
and moved the code of the .cpp file to the only 2 users (which did not use any mmethod in common) : MDFIO.cpp and RawDataCnvSvc.cpp
and moved the code of the .cpp file to the only 2 users (which did not use any mmethod in common) : MDFIO.cpp and RawDataCnvSvc.cpp