CSPACE-2932: Implement the Main Body group of three fields as a repeatable group...

CSPACE-2932: Implement the Main Body group of three fields as a repeatable group in Organization item records, in the services layer. Complications include a short display name computed from one of those three fields, shortName; a missing shortName field in the UI layer reflecting possible confusion with the shortIdentifier field; and a change in the summary field for app layer mini-records to the displayName field, from the longName field. Although all services and app layer tests pass, and behavior in the UI appears appropriate, we should remain vigilant for any unexpected side effects that may crop up from this change.