* python/PyG4Atlas.py, python/SimAtlasKernel.py,
	python/SimCtbKernel.py, python/atlas_mctruth.py,
	python/ctb_common.py: drop configuration related to
	RecordingEnvelopes, UserActions, Field and
	FieldIntegrationParameters. Remove back-compatibility for pre 20.3
	releases. Switch to using CfgGetter method for G4AtlasAlg. Remove
	obsolete __checks method. Remove configuration related to
	VertexPositioner, PrimaryEventRotation and
	BeamEffectTransform. Remove configuration of RandomNumberSvc via
	physicsMenu.
	* python/SimFlags.py (SimLayout): drop geometries which have been
	made obsolete in r21.
	(PhysicsList): Add support for FTFP_BERT_ATL physics list. Add
	G4Stepper, UseV2UserActions, UserActionConfig and
	OptionalUserActionList JobProperties.
	* python/atlas_flags.py: Drop VertexPositioner,
	PrimaryEventRotation and BeamEffectTransform from EventFilter. Add
	TightMuonStepping, PhysicsOptions JobProperties. Remove obsolete
	GMSBIndex, AMSBIndex and PionIndex JobProperties.
	* share/jobOptions.G4Atlas.py,
	share/jobOptions.G4Atlas_ReadEvgen.py,
	share/jobOptions.G4Cosmic.py - add BeamEffectsAlg.
	* Tagging: G4AtlasApps-00-12-00 (G4AtlasApps-00-12-00)

	* Merging in changes from G4AtlasApps-00-11-00-17. ATLASSIM-2870
	* python/PyG4Atlas.py, python/SimAtlasKernel.py,
	python/SimCtbKernel.py, python/atlas_mctruth.py,
	python/ctb_common.py: drop configuration related to
	RecordingEnvelopes, UserActions, Field and
	FieldIntegrationParameters. Remove back-compatibility for pre 20.3
	releases. Switch to using CfgGetter method for G4AtlasAlg. Remove
	obsolete __checks method. Remove configuration related to
	VertexPositioner, PrimaryEventRotation and
	BeamEffectTransform. Remove configuration of RandomNumberSvc via
	physicsMenu.
	* python/SimFlags.py (SimLayout): drop geometries which have been
	made obsolete in r21.
	(PhysicsList): Add support for FTFP_BERT_ATL physics list. Add
	G4Stepper, UseV2UserActions, UserActionConfig and
	OptionalUserActionList JobProperties.
	* python/atlas_flags.py: Drop VertexPositioner,
	PrimaryEventRotation and BeamEffectTransform from EventFilter. Add
	TightMuonStepping, PhysicsOptions JobProperties. Remove obsolete
...
(Long ChangeLog diff - truncated)


Former-commit-id: 05d45d2c