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Commit 74fd94df authored by Mark OLESEN's avatar Mark OLESEN
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REGRESSION: overly aggressive handling of MPI groups 

- attempted reduction in bookkeeping (commit: 068ab8cc) meant that
  the worldComm didn't have a group from which sub-communicators could
  be spun off.

- do not force reset of PstreamBuffers positions

STYLE: UPstream::globalComm instead of '0'
parent 1dbb54c3
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