Fixed #13165 -- Added edit and delete links for admin related fields.

- [ ] Don't add change and edit links for `<select multiple>`
- [ ] Document `get_object()` breakages
- [ ] Document `response_delete()` breakages
- [ ] Add a release note
Actually, get_object is undocumented so it should be fine if be change it slightly. (Though would be nice to put in the release notes.)

A few more thoughts:
- Have the edit link (and maybe the delete link too) simply be a regular link generated server side, not a popup. The downside is it doesn't auto-update when you change the value in the select box.
- Somehow annotate <option data-pk="42"> (not easy :). Again, don't popup. The popup is useful for Add, and not as useful for edit and delete.
- Only pass in from_field when we're not working with the pk. That should cover 90% of cases.
- (mostly unrelated) How should get_object() work for composite keys?