Rename processID and add some doxygen documentation from openSource

...VirtualFluids_GPU/Calculation/CalcTurbulenceIntensity.cpp

src/gpu/VirtualFluids_GPU/Calculation/Cp.cpp

src/gpu/VirtualFluids_GPU/Calculation/DragLift.cpp

src/gpu/VirtualFluids_GPU/Calculation/ForceCalculations.cpp

src/gpu/VirtualFluids_GPU/Calculation/PlaneCalculations.cpp

...U/DataStructureInitializer/GridReaderFiles/GridReader.cpp

src/gpu/VirtualFluids_GPU/FindQ/DefineBCs.cpp

src/gpu/VirtualFluids_GPU/LBM/LB.h

src/gpu/VirtualFluids_GPU/LBM/Simulation.cpp

src/gpu/VirtualFluids_GPU/Output/FileWriter.cpp

src/gpu/VirtualFluids_GPU/Output/VeloASCIIWriter.hpp

src/gpu/VirtualFluids_GPU/Parameter/Parameter.cpp

src/gpu/VirtualFluids_GPU/Parameter/Parameter.h

.../VirtualFluids_GPU/PreCollisionInteractor/Probes/Probe.cu