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Issue created Apr 14, 2016 by Theo Steininger@theosContributor

Move obj.bincount and obj.unique into distributor and make them more efficient.

For efficiency, use Allreduce instead of allgather in bincount. Use fast-summation in obj.unique http://materials.jeremybejarano.com/MPIwithPython/collectiveCom.html#fastsum

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