* Rename `unique_id` to `tag_name`.
* Add `other_names` and `profile_urls` methods that sources can override
to provide extra names or urls when creating new artist entries.
* When creating an artist by clicking the '?' next to the artist tag in
the tag list, prefill the new artist form by finding the artist's last
upload and fetching its source data.
Previously we filled the urls with the source of the artist's last
upload, which was wrong because it was usually a direct image URL (#3078).
* Fix the other names field not escaping spaces within names to underscores.
* Fix the other names field being potentially prefilled with duplicate names.
https://danbooru.donmai.us/forum_topics/9127?page=265#forum_post_153180:
> I'm not sure how to reproduce this, but sometimes on the upload page
> when I click the button to pop out the tag box, the screen scrolls up to
> the picture but the box doesn't pop out, and I have to scroll back down
> and click it again
https://danbooru.donmai.us/forum_topics/9127?page=266#forum_post_153183:
> Yes, this was brought up by Unbreakable on Discord a while back. It's
> due to the fact that the event handler that pops out the dialog box has
> not yet been bound by the time you click it. Since that clickable
> control has an empty anchor link of "#" which goes nowhere, it therefore
> redirects the user to the top of the page.
Bug: Notes weren't rescaled when the 'final_source' field was given
during replacement.
The cause was that the notes were rescaled after the source was saved,
but saving the source clobbered `image_{width,height}_before_last_save`
inside `rescale_notes`.
Regressed in b0c2ddba.
* Normalize spaces to underscores when saving other names. Preserve case
since case can be significant.
* Fix WikiPage#other_names_include to search case-insensitively (note:
this prevents using the index).
* Fix sources to return the raw tags in `#tags` and the normalized tags
in `#normalized_tags`. The normalized tags are the tags that will be
matched against other names.
* Move group name beneath the artist name.
* Replace 'Active' column with '(deleted)' notice next to artist name.
* Combine updater, updated at, and ip address fields in single column.
* Combine templates for standard listing and revert listing (only
difference is presense of 'Revert to' column).
