FLUID-5045: Upgraded Pager to use new ChangeApplier relay - test cases updated with new dependencies on ModelTransformation, (partial) bug fix for failure to relay initial model event for a modelListener attaching to a component which has already instantiated, fix for improper copying of model during transaction commit which caused failure to detect self-invalidation, corrected model idiom to have new model in place before firing commit event, general tidyup of old code and commenting, added new parallel "Relay" grades for all framework model-bearing grades, all tests passing