new private method _longRound; _stdev method now does all math in long, and returns long instead of float; mean and median methods refactored to use _longRound --KW
corrected return type for stdev() in Filter.h; implemented signalToNoise() method --KW
fixed stdev code to remove overflow; added multiplier arg to _longRound(); comment changes --KW
changed code to multiply by 10 for FP math, instead of 100, due to potential overflow --KW
added back an accidentally deleted line from stdev(); working on _moveOver() and _orderedInsert2() but not tested yet --KW
signalToNoise() change to return percentage, and corrected to avoid divide-by-zero error; _orderedInsert2 completed and tested --KW
corrected math in signalToNoise(); implemented signal percentage tests --KW