* OverlayAlgBase/OverlayAlgBase.h,
	OverlayAlgBase/OverlayAlgBase.icc, src/OverlayAlgBase.cxx -
	migrate to using AthAlgorithm rather than Algorithm as the
	baseclass. Still need to sort out StoreGates though.

	* tagging OverlayAlgBase-00-02-00