Update UKFTractography
Merge pull request #531 from pnlbwh/update-UKFTractography

Update UKFTractography
Update UKFTractography

Revert commit d5b81cd to exclude Hans change related to template-depth
issue.

This is done waiting the UKF extension itself is updated.
Merge branch 'update-UKFTractography'

* update-UKFTractography:
  Update UKFTractography
Add ShapePopulationViewer
Merge pull request #532 from agirault/add-ShapePopulationViewer

Add ShapePopulationViewer