update event overlay configuration (EventOverlayJobTransforms-00-06-00)

	* python/overlayTrfArgs.py, python/overlayTransformUtils.py, share/skeleton.BSOverlayFilter_tf.py, share/ConfiguredOverlay_jobOptions.py, share/Level1Overlay_jobOptions.py, share/synchFlags_jobOptions.py, share/g4runnumber.py, share/skeleton.commis.py, share/InnerDetectorOverlay_jobOptions.py, share/SignalOutputItemList_jobOptions.py, share/TileMcSignal_jobOptions.py, share/skeleton.OverlayBS_tf.py, share/OverlayOutputItemList_jobOptions.py, share/skeleton.BSFilter.py, share/MuonMcSignal_jobOptions.py, share/LArMcSignal_jobOptions.py, share/skeleton.overlay.py, share/BeamOverlay_jobOptions.py, share/TruthOverlay_jobOptions.py, share/L1Signal_jobOptions.py, share/CaloOverlay_jobOptions.py, share/MuonOverlay_jobOptions.py, share/InDetMcSignal_jobOptions.py, share/skeleton.OverlayPool_tf.py, scripts/OverlayChain_tf.py - update event overlay configuration: add an overlay section to DetFlags.py, convert OverlayFlags to jobproperties, use a TXT output for the events.txt output written by the initial BSFilter step in OverlayChain_tf.py. ATLASSIM-1921. Requires AthenaCommon-03-03-03
	* EventOverlayJobTransforms-00-06-00