1. Fixed the Hang problem while intensely using the Paintbrush over large ROI area for prolonged time 2-3 min.
2. Provided a clearer message when User attempts to use ROI-4D in dynamic modelling (only 3D ROIs are allowed).
3. RoiStats4D dialog with ROI3D: fixed the base Time issue when saving the TAC to .txt file.
4. Layer Drag-n-drop between documents: complete ViewFilter is now correctly copied.
5. Added ABT subtest for FVX: Save-Load-Compare operation.
