Second generation of local landmark refinement using registration

1. Merge master onto the branch
2. Switched to using BRAINSfit as that is the standard registration CLI available in Slicer
3. Modified method to refine just the selected landmark
4. Fixed bug on transforming landmark through the resulting transformation
5. Object and scene cleanup
6. Increased the size of the search space in the moving image

Intermittent crash when updating the visualization. Could be linked to the deletion of the
crop widgets