Merge branch 'engine_exchange_strays' into 'master'
Engine exchange strays Tested this locally with and without MPI. Didn't actually test sending around gparts, because we can't really deal with them quite yet. See merge request !117
Engine exchange strays Tested this locally with and without MPI. Didn't actually test sending around gparts, because we can't really deal with them quite yet. See merge request !117