MPI and other improvements

Klossrequested to merge
for_master into master

This merge request addresses several points:

  • MPI: By using mpi.reduce instead of mpi.Reduce, it makes obsolete the need to know the array dimension on all MPI ranks.
  • Array reshape of manybody.Wavefunction has been refactored to a new routine.
  • Dataclasses: Remaining dependencies on dataclasses in the unittests were removed.
  • Filterwarnings were adapted.

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