* Updated HitIdHelpers to be safe for multi-threading.
		* TRTHitIdHelper and SiHitIdHelper are now safe to retrieve
		  concurrently.
		* SiHitIdHelper is now a context-specific singleton in Hive.
		* Locked Storegate usage in SiHitIdHelper Initialize method
		  which was previously thread-unsafe.
	* tag as InDetSimEvent-00-06-00

	* src/SiHitIdHelper.cxx - include barrelendcap range extension for
	dbm dictionaries.
	* tag as InDetSimEvent-00-05-08