Optimize the Utils.stdDev function
This patch optimizes the stdDev function in two respects:
- first, we don't do sum . map which builds an intermediate list, but
instead use a fold over the list to build incrementally the sum;
this should reduce both the time and space characteristics, as we
have fewer objects created
- second, we move from “a ^ 2” to “a * a” as the latter has a much
simpler implementation and thus a higher performance
Since the ‘square’ function is obsoleted by the above the patch also
removes it.