data exchange F3/G6 first edition by MSch

src/VirtualFluids_GPU/Communication/ExchangeData27.cpp

src/VirtualFluids_GPU/Communication/ExchangeData27.h

...tructureInitializer/GridReaderGenerator/GridGenerator.cpp

src/VirtualFluids_GPU/GPU/CudaMemoryManager.cpp

src/VirtualFluids_GPU/GPU/CudaMemoryManager.h

src/VirtualFluids_GPU/GPU/ExchangeData27.cu

src/VirtualFluids_GPU/GPU/GPU_Interface.h

src/VirtualFluids_GPU/GPU/GPU_Kernels.cuh

src/VirtualFluids_GPU/GPU/LBMKernel.cu

src/VirtualFluids_GPU/LBM/LB.h

src/VirtualFluids_GPU/LBM/Simulation.cpp

src/VirtualFluids_GPU/Parameter/Parameter.cpp

src/VirtualFluids_GPU/Parameter/Parameter.h

targets/apps/LBM/TGV_3D_MultiGPU/TGV_3D_MultiGPU.cpp