Improvements to aeva's geometric data.
- Store geometry in any VTK format (not just images) to accommodate MED file support.
- Add a greyscale colormap to Nifti images so they render properly (in combination with cmb/smtk!1922 (merged) .
System updates will be applied on Nov 25th between 7am and 9am, EST (UTC-05:00). This site will have intermittent downtime during that time.