Fixed defect:  when any type volume is displayed, if user presses ViewFilter for this volume, there is a fairly long wait and the "Compute Histogram" message is displayed.
This was fixed by removing Histogram recalculation and instead using compressed block header access without decompressing the blocks themselvves to find maximal voxel value of the volume.

Creating a fully integrated workflow of 4D PET registration to MRI, so that user does not have to manually crop and change orientation of PET prior to registration.

Noticed a slower than expected (20 sec for WSINC interpolation) final transformation after registration for REAL time volume as a Source that being transformed to Target.  Investigating potential speedup...