Autodetect if we have MPI_GPU support #244
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I don't want to make the switch automatic, but giving a more informative message to the user whether we detect it enabled or not might be useful for debugging configurations (for example, I recently needed it for debugging some issues)...
The scripts are taken from https://dci.dci-gitlab.cines.fr/webextranet/software_stack/libraries/index.html#detecting-if-mpi-is-gpu-aware