Per my prior mail, I just filed a patch on CMR #1198 to print a big
warning on MPI_COMM_WORLD rank 0 if MPI_THREAD_MULTIPLE and/or
progress threads are used. We know that this functionality basically
doesn't work, so instead of getting lots more mail to the users list,
let's at least put a disclaimer message at run time saying that it
Anyone have any objections to putting this in v1.2.5?