Distortion field modification and fix to motion correction freq
floor/round fix in BSpline. retabbed mrimage_utils. Changed spacing in
smoothDownsample to equal standard deviation
switched to constantly updating value range in DistortionComputer
Fixed for iterator, smoothDownsample. New image comparisons
added distortion correction test 3
Merge branch 'master' of github.com:MicahChambers/npl