Fix cell-data issues
Addresses issue #17861.
- Fixes image misalignment when using cell-data of a large type.
- Adds support for cell-data in vtkSmartVolumeMapper::MAGNITUDE.
System updates will be applied on Nov 27th between 7am and 9am, EST (UTC-05:00). This site will have intermittent downtime during that time.
Addresses issue #17861.