2014.12.20 MSS Code Factory 2.0.12718 CFCore 2.1 model enhanced to restructure internal relationships

The internal relationships used for the GEL runtime have been restructured to
use independent relationship key attributes instead of sharing the TenantId and
CartridgeId of the object.  With the latter, some of the attributes were non-null
so the ORM code would try to resolve the null relationship against the database,
finding no matching lookup.  (I really should check for that and throw an exception.)