[OGS Tools] Add MPI_Init() and MPI_Finalize()

Merged Tom Fischer requested to merge TomFischer/ogs:FixToolInMPIEnvironment into master

Also changes behavior of file output of the PETSc configuration:

When run with only one process (either via regular ogs ... or mpirun -np 1 ogs ...) the output files are named the same as with non-PETSc configs (e.g. .vtu instead of .pvtu).

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
Edited by Lars Bilke

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