Currently mpi4py has become a general requirement for hyppopy. This could become problematic for hyppopy users that do not need mpi, as mpi4py is not trival to install/build at als system.

We should discuss, if we either can make mpi4py a optional dependency or if we need to introduce a dedicated hyppopy4mpi (hyppoMPI) package (or so) to deliver the mpi functionalities on demand but not as gerneral dependency.

We have to brainstorm about this.