[PCS] Added an argument to Process::getProcessVariables

ProcessLib/ComponentTransport/ComponentTransportProcess.cpp

ProcessLib/GroundwaterFlow/GroundwaterFlowProcess.cpp

ProcessLib/GroundwaterFlow/GroundwaterFlowProcess.h

ProcessLib/HT/HTProcess.cpp

ProcessLib/HeatConduction/HeatConductionProcess.cpp

ProcessLib/HydroMechanics/HydroMechanicsProcess-impl.h

ProcessLib/LIE/HydroMechanics/HydroMechanicsProcess.cpp

ProcessLib/LIE/SmallDeformation/SmallDeformationProcess.cpp

ProcessLib/LiquidFlow/LiquidFlowProcess.cpp

ProcessLib/Output/Output.cpp

ProcessLib/Process.h

...sComponentTransport/RichardsComponentTransportProcess.cpp

ProcessLib/RichardsFlow/RichardsFlowProcess.cpp

ProcessLib/TES/TESProcess.cpp

...alTwoPhaseFlowWithPP/ThermalTwoPhaseFlowWithPPProcess.cpp

ProcessLib/TwoPhaseFlowWithPP/TwoPhaseFlowWithPPProcess.cpp

...sLib/TwoPhaseFlowWithPrho/TwoPhaseFlowWithPrhoProcess.cpp