Add workaround in CtoF, and extra fs in precursorBC

apps/gpu/LBM/BoundaryLayer/BoundaryLayer.cpp

src/gpu/GridGenerator/VelocitySetter/VelocitySetter.cpp

src/gpu/VirtualFluids_GPU/Calculation/UpdateGrid27.cpp

...tructureInitializer/GridReaderGenerator/GridGenerator.cpp

src/gpu/VirtualFluids_GPU/GPU/GPU_Kernels.cuh

...VirtualFluids_GPU/GPU/GridScaling/scaleCF_compressible.cu

...VirtualFluids_GPU/GPU/GridScaling/scaleFC_compressible.cu

src/gpu/VirtualFluids_GPU/GPU/LBMKernel.cu

src/gpu/VirtualFluids_GPU/GPU/PrecursorBCs27.cu

...rtualFluids_GPU/PreCollisionInteractor/PrecursorWriter.cu

...irtualFluids_GPU/PreCollisionInteractor/PrecursorWriter.h