add test for acoustic pulse with CompressibleCumulant4thOrderViscosityLBMKernel and bulk viscosity equel 10 times shear viscosity

add test acoustic pulse for DLR-F16 simulation environment, add FLOAT64 / double support in WbWriterVtkXmlBinary / WbWriterVtkXmlASCII, bat only for writeOctsWithNodeData

Merge branch 'dem_coupling' of http://elladan.irmb.bau.tu-bs.de/hulc/VirtualFluids into dem_coupling

# Conflicts:
#	source/Applications/pChannel/configBombadilpChannel.cfg

excludes friend classes from Block3D; adds Checkpoint Converter; adds Breugem channel with anisotropic porous medium setup

add ShadowCopy, add WritePeBlocksCoProcessor, add nozzles, stable simulation, InteractorsHelper add delete flag

# Conflicts:
#	source/Applications/pChannel/configBombadilpChannel.cfg

excludes friend classes from Block3D; adds Checkpoint Converter; adds Breugem channel with anisotropic porous medium setup