Fully parallelized the ROI Tac calculation (F4) - great speed-up

Fixed a major "racing condition" during the parallel load of ".FVX" files.

Parametric model calculation for a Single ROI TAC:  expanded the progress message to include the name of currently processed model.

Parametric model calculation:  expanded the progress message to include the name of currently processed model.

Dynamic segmentation verification dialog (Segmentation by 4D-patches):  pre-calculate all the TACs for all ROIs during the dialog initialization so later on User has an instant access to all TACs.