https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#con1-by-default-make-objects-immutable

change the datatype of the variable numberOfNodes aka numberOfLBnodes (fka size_Mat) to unsigned long long ... with respect to large grids (>100e^6 Nodes per Level) ... in this regard the 27 directions are changed to size_t and some control variables are also changed to size_t

# Conflicts:
#	src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.cpp
#	src/gpu/VirtualFluids_GPU/GPU/GridScaling/scaleCF_compressible.cu
#	src/gpu/VirtualFluids_GPU/GPU/GridScaling/scaleFC_compressible.cu

conditioning of the grid scaling functions (coarse to fine and fine to coarse)

Closes #49

See merge request irmb/VirtualFluids_dev!162

Adds hpc-rocket config. Python bindings don't need CUDA if only CPU....

See merge request irmb/VirtualFluids_dev!149

Adds hpc-rocket config. Python bindings don't need CUDA if only CPU. Multistage PoiseuilleTestContainer

Fix some Sonarqube code smells

See merge request irmb/VirtualFluids_dev!173