Merge remote-tracking branch 'upstream'

.gitlab-ci.yml

CMakeLists.txt

cmake/waLBerlaHelperFunctions.cmake

src/blockforest/loadbalancing/DynamicParMetis.cpp

src/blockforest/loadbalancing/DynamicParMetis.h

src/core/mpi/MPIHelper.cpp

src/pe/amr/weight_assignment/MetisAssignmentFunctor.h

src/pe/cr/DEM.h

src/pe/cr/DEM.impl.h

src/pe/cr/Integrators.h

src/pe/cr/PlainIntegrator.h

src/pe/cr/PlainIntegrator.impl.h

src/pe/rigidbody/CylindricalBoundary.cpp

src/pe/rigidbody/CylindricalBoundary.h

src/python_coupling/Manager.cpp

src/waLBerlaDefinitions.in.h

tests/pe/CMakeLists.txt

tests/pe/ParMetis.cpp

...um_exchange_method/SettlingSphereMEMDynamicRefinement.cpp