Add manual registration adjustment spinboxes for CBCT to measured gel registration step

[cpinter]

After the landmark registration of the CBCT and the measured VFF, similar controls as what are there after the first (image-based or landmark) registration step.

[cpinter]

Migrated from https://app.assembla.com/spaces/slicerrt/tickets/857-add-manual-registration-adjustment-spinboxes-for-obitomeasured-registration-step-i/details