[python,parallel] improve compatibility of Dune::Communication<...> and mpi4py
- add MPI_Comm wrapper
- add conversion from mpi4py.MPI.Comm to MPI_Comm wrapper
- allow to construct dune.common.Communication from mpi4py.MPI.Comm
-
additional tests -
possibly move to a submodule(discussion postponed)parallel
Edited by Christian Engwer