fix GbCylinder / Rheometer setup, add MutiphaseDropletTest

apps/cpu/Applications.cmake

apps/cpu/LaminarTubeFlow/ltf.cpp

apps/cpu/Multiphase/Multiphase.cfg

apps/cpu/Multiphase/Multiphase.cpp

apps/cpu/MultiphaseDropletTest.zip

apps/cpu/MultiphaseDropletTest/CMakeLists.txt

apps/cpu/MultiphaseDropletTest/DropletTest.cfg

apps/cpu/MultiphaseDropletTest/droplet.cpp

apps/cpu/ViskomatXL/viskomat.cfg

apps/cpu/ViskomatXL/viskomat.cpp

apps/cpu/rheometer/rheometer.cfg

apps/cpu/rheometer/rheometer.cpp

apps/cpu/rheometer/viscosity.cfg

src/basics/geometry3d/GbCylinder3D.cpp

src/cpu/VirtualFluids.h

src/cpu/VirtualFluidsCore/BoundaryConditions/BCAlgorithm.cpp

src/cpu/VirtualFluidsCore/BoundaryConditions/BCAlgorithm.h

...tualFluidsCore/BoundaryConditions/VelocityBCAlgorithm.cpp

...ualFluidsCore/CoProcessors/CalculateTorqueCoProcessor.cpp

...rtualFluidsCore/CoProcessors/CalculateTorqueCoProcessor.h