Expose sparse NNLS to Python #42
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There seem to be no other sparse implementations of Lawson-Hanson NNLS accessible from Python, so let's expose the one we ship in photospline.
Almost all of the new code is there to build a
cholmod_sparseview into the suppliedscipy.sparse.csc_matrix, which is more complicated that it should be due toscipy.sparse's insistence on falling back to int32 for the column indices and row pointers of small matrices.