uses the traffic sim to set concentration in the second component

src/Traffic/TrafficMovementFactory.cpp

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

src/VirtualFluids_GPU/GPU/AdvecDiffBCs27.cu

src/VirtualFluids_GPU/LBM/Simulation.cpp

src/VirtualFluids_GPU/Parameter/Parameter.cpp

src/VirtualFluids_GPU/Parameter/Parameter.h