For stills, when removing the scan/gonio prior to indexing in indexer.py, save _models. This preserves any changes done to the imageset prior to indexing.
For stills, when removing the scan/gonio prior to indexing in indexer.py, save _models. This preserves any changes done to the imageset prior to indexing.

Needed for upcoming commit the enables reference geometries for stills indexing.

dials/dials,dials/dials,dials/dials,dials/dials,dials/dials