Fix bugs in undocumented sparse matrix conversion functions #124
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I'll add tests before merging this PR. But I want to note these necessary changes now as I'm discovering them.
A note: these functions were for converting from CSC or CSR format to COO format. Our examples which read sparse matrices from disk and run low-rank approximation algorithms were never unaffected. Those files only use conversions from COO to CSC or CSR.