ref #6190 removing svn property place holder in first line of code
added exists method to interface and implementing classes
ICdmCacher, ICdmUuidCacher, CdmCacher, CdmTermCacher : refactored and added load method Language, NameRelationshipType, Rank : now uses cacher only if termap is null or empty and only when class matches the specific term type MockCdmCacher: not required anymore...