[tests] renaming units ModelIPID to Model; ModelMgr to ModelRegistry.
[tests] merging ipid and proxy models into ModelContact
[tests] renaming Contact models to Model<IDtype>Contact
[tests] renaming mapping manual to mappingContact
[tests] renaming abstract Contact testcase classes to <IDtype>ContactTestCase
[tests] moving abstract sql mapping to a new unit
[opf] initial inheritance implementation