implemented a new NEQ BC for Basel Setup (fix effects at the periodic BCs)

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

src/VirtualFluids_GPU/GPU/AdvecDiffBCs27.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/Simulation.cpp

targets/apps/LBM/Basel/main.cpp