UP-4030:  Initial merge of work to convert definition of PAGS groups from XML file to JPA-managed entities;  this delta is feature complete;  there have been 4 sets of eyes (min) and 3 sets of hands on this solution to date;  there's room for refactoring and improvements, but it has reached a point where it's ready to be included;  currently the new strategy is DISABLED by default (legacy strategy is enabled), but we should revisit that choice before the 4.1 release