Improve testing and implementation of VRP for add and sub.
Improve testing and implementation of VRP for add and sub.

DmitryOlshansky/SDC,sidmutha/SDC,schancel/SDC,DmitryOlshansky/SDC,bpr/SDC,SDC-Developers/SDC,schancel/SDC,deadalnix/SDC,DmitryOlshansky/SDC,sidmutha/SDC,UplinkCoder/SDC,sidmutha/SDC,schancel/SDC,bpr/SDC,SDC-Developers/SDC,JohanEngelen/SDC,SDC-Developers/SDC,JohanEngelen/SDC,deadalnix/SDC,UplinkCoder/SDC,JohanEngelen/SDC,deadalnix/SDC,UplinkCoder/SDC,bpr/SDC