Add CMFreg extension
Merge pull request #454 from viboen/add-CMFreg

Add CMFreg extension
Update AirwaySegmentation extension
Merge pull request #455 from PietroNardelli/update-AirwaySegmentation

Update AirwaySegmentation extension
FIX: Fixed volume rendering related memory leak.
Merge pull request #458 from paulcm/update-LongitudinalPETCT

FIX: Fixed volume rendering related memory leak.
Update UKF Extension
Merge pull request #459 from pnlbwh/update-UKFTractography

Update UKF Extension