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Fix the bug reported on the mailing list w.r.t. to using cartesian communicators when opening a file.

the cart_based_grouping aggregator strategy was not correctly updated
during the last major rewrite of the aggregator selection algorithm.
It is also not supposed to be called from file_open (but from
file_set_view).

Signed-off-by: Edgar Gabriel <[email protected]>
update the cartesian communicator based grouping strategy to match the other
algorithms used in the aggregator selection process.

Signed-off-by: Edgar Gabriel <[email protected]>
@edgargabriel edgargabriel merged commit 70107b3 into open-mpi:master Jun 15, 2017
@edgargabriel edgargabriel deleted the pr/cart-comm-file-open-fix branch August 10, 2017 19:43
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