COMP: non-group-local communicator for MS-MPI (mingw)
- partial revert for 13740de4 (#2158) MS-MPI does not currently have a MPI_Comm_create_group(), so keep using MPI_Comm_create() there. Only affects multi-world simulations. CONFIG: retain dummy version of libPstream.dll - retain as libPstream.dll-dummy so that it is available for manual replacement of the regular libPstream.dll (#2290) Keep extra copy of libPstream.dll as libPstream.dll-msmpi (for example) for manual replacement.
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