Refactor to use a std::pair to hold factor index and axis refs. #200
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Refactor to use a std::pair to hold factor index and axis refs.
This simplifies the logic a bit, and aligns better with the algorithm which picks the factor-axes pair with the largest count at each iteration. Also prepares a different implementation that keeps a mapvector of factor-axes pairs and treverses the vector in the non-increasing order of their counts.