optimize Parallel::send_receive() for the case when the source and destination are both the local processor.
optimize Parallel::send_receive() for the case when the source and destination are both the local processor.

git-svn-id: e88a1e38e13faf406e05cc89eca8dd613216f6c4@2712 434f946d-2f3d-0410-ba4c-cb9f52fb0dbf

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