MPI DArray: finished distribute, reduce and allocations #422
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Allows the `DArray` to participate in MPI operations, by building on the newly-added support for "MPI-style" partitioning (i.e. only the rank-local partition is stored), via a new `MPIBlocks` partitioner. This commit also implements MPI-powered `distribute` and `reduce` operations for `MPIBlocks`-partitioned arrays, which support a variety of distribution schemes and data transfer modes.
Fdat/mpi test implementation
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This PR wraps up the base version of the DArray for MPI, including randomized allocations, ones, zeros, distribute without specified partition dimensions, and all the variations of reduce (sum, prod, reduce with a root, and without a root), including reduce dims and all-collect.