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

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

fix bug and remove redundant initialisation in MultiphaseSetKernelBlockVisitor / remove unused parameter in MultiphaseInitDistributionsBlockVisitor

Merge branch 'NewPhaseField' of https://git.rz.tu-bs.de/k.kutscher/VirtualFluids_dev into NewPhaseField

Implements a phase distrortion limiter which is supposed to improve stability. The limiter value is currently hard code to an arbitrary value: limVis = 0.0000001;

fix an issue with initialization  of beta and kappa parameters in MultiphaseTwoPhaseFieldsPressureFilterLBMKernel after restarting, need global refactoring kernel parameters

# Conflicts:
#	apps/cpu/Multiphase/Multiphase.cfg
#	apps/cpu/Multiphase/Multiphase.cpp
#	apps/cpu/ViskomatXL/viskomat.cfg

Pressure filter and pressure gradient computed so that boundary conditions can be used. Everything is limited to a single block.