Give an explicit error message if MPI can't be called from a sub-process #18
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…st if MPI works with sub-processes. Added exception.py
BerengerBerthoul
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See #17 . At least OpenMPI 4.0.5 does not allow mpirun to be called from a sub-process.
This PR now gives an explicit error message with the shell scheduler if the MPI implementation can't be called from a sub-process.
Also implement two minor misc improvements :