Now MultiphasePressureFilterLBMKernel pressure update is also corrected (wrong fiel in previous commit).

corrects pressure update in MultiphaseTwoPhaseFieldsPressureFilterLBMKernel, MultiphasePressureFilterCompressibleAirLBMKernel and MultiphasePressureFilterCompressibleAirLBMKernel. MultiphasePressureFilterCompressibleAirLBMKernel is not yet different from MultiphasePressureFilterCompressibleAirLBMKernel and hence not yet compressible.

# Conflicts:
#	apps/cpu/ViskomatXL/viskomat.cpp
#	src/cpu/VirtualFluidsCore/CoProcessors/CalculateTorqueCoProcessor.cpp
#	src/cpu/VirtualFluidsCore/CoProcessors/MPIIOMigrationBECoProcessor.cpp
#	src/cpu/VirtualFluidsCore/CoProcessors/MPIIOMigrationBECoProcessor.h
#	src/cpu/VirtualFluidsCore/CoProcessors/MPIIOMigrationCoProcessor.cpp
#	src/cpu/VirtualFluidsCore/CoProcessors/MPIIOMigrationCoProcessor.h
#	src/cpu/VirtualFluidsCore/CoProcessors/MPIIORestartCoProcessor.cpp
#	src/cpu/VirtualFluidsCore/Utilities/CheckpointConverter.cpp

add pressure filter kernel with one phase field / add double ghost layer connectors for two distributions and pressure

fix viscosity correction  and optimize muParser variable definition in MultiphaseTwoPhaseFieldsPressureFilterLBMKernel

Added cuda and mpi library (Closes #20)

Closes #20

See merge request irmb/VirtualFluids_dev!70

Conflicts:
	apps/cpu/ViskomatXL/viskomat.cpp
	src/cpu/VirtualFluidsCore/CoProcessors/CalculateTorqueCoProcessor.cpp
	src/cpu/VirtualFluidsCore/Interactors/D3Q27TriFaceMeshInteractor.cpp

# Conflicts:
#	CMakeLists.txt
#	src/gpu/VirtualFluids_GPU/LBM/Simulation.cpp

Run python build and tests only when scheduled due to long build times and a not working reuse of the cache.

fixed AL

See merge request irmb/VirtualFluids_dev!81