1. Use smarter control function (see paper)

2. Fix some issues with integrating U properly.
Now you can see this kind of output, ensure that you have
U ranging +/- 3.0

Integrating:  KSegmentor3D::integrateUserInputInUserInputImage(), N= 0
maxU = 0
minU = 0
minU = -0.333333
minU = -1.66667
minU = -2.66667
minU = -3.33333
maxU = 0.333333