Speedup the reduce method of the maximum minimum family of ufuncs. #18
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These patches add reduce loop detection to the maximum/minimum/fmax/fmin ufuncs and then implement the nanmax and nanmin functions using fmax.reduce and fmin.reduce. Some tests have also been added/fixed.
The fmax and fmin reduce loops can be further speeded up by fixing things so that the isnan function call is avoided, but that is for another day.