reduced writing to vtk

src/GridGenerator/StreetPointFinder/StreetPointFinder.cpp

src/GridGenerator/StreetPointFinder/StreetPointFinder.h

src/Traffic/TrafficMovementFactory - Kopie.cpp

src/Traffic/TrafficMovementFactory - Kopie.h

src/Traffic/TrafficMovementFactory.cpp

src/Traffic/TrafficMovementFactory.h

src/VirtualFluids_GPU/LBM/Simulation.cpp

src/VirtualFluids_GPU/LBM/Simulation.h

targets/apps/LBM/TrafficTest/Traffic_Main.cpp