Merge pull request #540 from RosettaCommons/vmullig/mpitests2
Tweak MPI-mode integration tests
This should help the stability of MPI-mode integration tests, by using Rosetta's internal ability to split tracer output by originating MPI process.
This merge also brings in one new params file.
Sergey -- could we turn the integration.mpi tests back on by default? I'd like to see how stable they are over a few commits in master. (Sorry to keep changing my mind about whether they're ready to be on, yet.)