Partially corrected psStats code. psStats/robustMedian handles small numbers of inputs correctly. psMinimizePolyFit attempts to scale the ordinary polynomial fit data by the median and scale to make the fitting somewhat more stable. psBinomialCoeff is necessary to implement this scaling, so it is added here as a stand alone function. There is still a bias in the fitting results that I need to sort out still, but this fixes the known stats failure modes.