Comment # 4 on bug 1080443 from Stefan Br�ns

The libmpi* dependency was pulled in from VTK, but this is no longer the case.
The default installation runs without any MPI dependency now.

*Iff* you really want to use MPI to speedup the calculations, you have to
explicitly activate the wanted MPI variant, e.g. using mpi-selector or using
the HPC modules.