Edit workflow improvements

Notes for next iteration of editing workflow.

[ ] entity edit success redirects to editgroup view, not to entity view
[ ] "redirect to page" behavior when logging in (so you end up on the page you wanted to access, eg the edit entity page)
[x] editgroup "diff" view
[ ] allow prefixed version of identifiers everywhere (eg, release_ofaixvk5wfdldgtgb6jimeacxu in addition to ofaixvk5wfdldgtgb6jimeacxu)
[ ] better UX for adding links between entities: "quick search"; display/summarize entity
[ ] "basic" review bot to catch most common issues upon submission
[ ] fix "updating creation edit results in update edit, not create edit" bug (in web interface?)
[ ] some workflow for requesting bot updates (eg, "update from ORCID", "update from Crossref")? three-way TOML merge interface?
[ ] actual user testing of edit workflow
[ ] compare against other editable systems: openlibrary, musicbrainz,

internetarchive / fatcat