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enhance UPstream communicator support

Mark OLESEN requested to merge feature-UPstream-startup into develop
  • split/duplicate functionality
  • always creates inter/intra communicators at startup.
  • rework inter-node/intra-node handling to allow selection of splitting based on shared or hostname (default).
  • world-comm is now always a duplicate of MPI_COMM_WORLD to provide better separation from other processes
Edited by Mark OLESEN

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