fixed S and F in PlanarAverageProbe and some clean-up in StressBC

apps/gpu/LBM/BoundaryLayer/BoundaryLayer.cpp

src/gpu/VirtualFluids_GPU/GPU/StressBCs27.cu

src/gpu/VirtualFluids_GPU/GPU/TurbulentViscosity.cu

...ntK17chim/TurbulentViscosityCumulantK17CompChim_Device.cu

...s_GPU/PreCollisionInteractor/Probes/PlanarAverageProbe.cu