Make Ord and Hash iterative to avoid stack overflow#156
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Converts the recursive continued-fraction algorithms in `Ord::cmp` and `Hash::hash` for `Ratio<T>` to iterative loops, preventing stack overflow when comparing or hashing ratios with very large numerators/denominators. Fixes rust-num#140
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Converts the recursive continued-fraction algorithms in
Ord::cmpandHash::hashforRatio<T>to iterative loops, preventing stack overflowwhen comparing or hashing ratios with very large numerators/denominators.
Fixes #140