Enabled the following User Interface-level functions for PET volumes:
a) Advance to the timepoint of Max Info
b) Optimize ViewFilter setting for the current timepoint

Continue to simplify code in numerous locations due to inclusion of the DIM3D field into the FRAME structure.

Small fixes related to the PET4D<->MR4D registration.  Build 135A is released.

FireVoxel Build 135 is released.

Finalized the algorithm and User interface for the 2 way "PET register to Anatomy" function.
Presently, {PET3D,PET4D}<->{MR3D,MR4D} can be registered. If both source and target are 4D user is given a choice for which one to keep in 4D.

All the additional layers (such as ROIs) are transformed properly.