Don't filter all signals the same

[moorepants]

BicycleDataProcessor has a simple filter method for each signal and the Run class can filter all included signals at the same low pass cutoff frequency. Peter is working with the data right now and we noticed that we shouldn't blindly use the filtering option of the Run class. I now realize that the lateral force in my analysis in my dissertation was attenuated a bit too much. See the attached figure. Just something to keep in my when playing with the data.