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These files lead to too many problems for new users. If you need
this data to be stored, e.g., for performace, use the cdn.hdf file.

I defined the mpi executable to be 'time' for the sequential tests. This is
to override pseudo-smartness of the testscript. I actually don't know
why the testscript enforces a default  mpi executable if none is provided.

This reverts commit d5f6aa8d.

Note: The CI is expected to fail at the moment because the test
only runs sequentially.

This reverts commit a0384b38.