[MPIPreferences] add functions to check (and error) if the MPI implementation has changed #670
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Currently call
@warn
if the MPI implementation has changed: in general I don't like using@warn
unless something is bad.Instead it will now use
@info
to print the information, but throws an error if MPI is already loaded, or is loaded subsequently.It also modifies the message from #641 to be a warning (since that presumably is bad).