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Tpetra: parallel kernels for CRS matrix addition (#1367)

James Willenbring requested to merge brian-kelley:ThreadedMatrixAdd into develop

Created by: brian-kelley

-Makes TpetraExt::MatrixMatrix::add very thread scalable in most cases -Kernels using Kokkos to locally add two Tpetra CrsMatrices -One kernel for the sorted graph, matching col map case, and a more general one for unsorted graph and/or mismatched col map case -Unit tests for both kernels

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