FireVoxel Build 156 is released.

1. Gradient withing URAL-radius to the Volume boundaries are set to 0 to avoid introducing non-existing features that might steer registration.

2. If one of the timepoints in registration is binary (as sometimes in hybrid scenario), the URAL_NORM=Linear is always chosen for that specific timepoint independent of what norm is specified by the user.

3. MainMenu>Volume>Effective Noise:  corrected the defects, crashes on 4D volumes4. RoiStats3D dialog:  added information about the number of the VOID voxels of the SI-Volume within the specified ROI.

4. Implemented the corrections to the Liver DCDI  4D registration parameters.  

Implemented the corrections to the Liver DCDI  4D registration parameters.  This was to fix example "OV" that had very high contrast enhancement thus failing the registration as high gradient inside the contrast regions were attracting the feature detector.
URAL_UNI measure was employed, with the sigmoid function base of 3*Noise.  Automatic noise detection step was added to the registration.