fix h2 distribution in MultiphaseNonReflectingOutflowBCAlgorithm; fix negative phi in MultiphaseVelocityBCAlgorithm and in MultiphaseSimpleVelocityBaseExternalPressureLBMKernel; add unit test für FineToCoarseVectorConnector; redesign nozzle simulation setup

Newest Update

Closes #53 and #24

See merge request irmb/VirtualFluids_dev!171

# Conflicts:
#	CMake/cmake_config_files/BOMBADIL.config.cmake
#	src/cpu/VirtualFluidsCore/CMakeLists.txt
#	src/cpu/VirtualFluidsCore/LBM/D3Q27System.h
#	src/lbm/constants/D3Q27.h

Fix some Code Smells (Sonarqube)

See merge request irmb/VirtualFluids_dev!169

Partially revert "Refactor  exchangeIndicesForCommAfterFtoC"

See merge request irmb/VirtualFluids_dev!168

This reverts commit cc7bb07a.

The refactored version using std::find instead of std::unique does not work for vectors containing a zero as a receiving index.  For example this is the case in the app BoundaryLayer --> revert to the old version.

Add some tests to GridGenerator in VFGPU

See merge request irmb/VirtualFluids_dev!167

Fix some technical debt in Sonarqube

See merge request irmb/VirtualFluids_dev!166

Add tests to exchangeIndicesForCommAfterFtoC and do some refactoring

See merge request irmb/VirtualFluids_dev!164

polymorphic deletion through a base pointer should not be allowed -> protected destructor (http://www.gotw.ca/publications/mill18.htm)

IndexRearrangementForStreams needs only a small subset of the Communicator's functionalities.
This change also makes testing easier. There is no need to derive from the concrete class Communicator to test IndexRearrangementForStreams anymore.