Refactor to use accepts_nested_attributes_for instead of the notes
attribute to facilitate editing wikis on the artist edit page.
This fixes the notes attribute unintentionally showing up in the API.
This also changes it so that renaming an artist entry doesn't
automatically rename the corresponding wiki page. This had bad behavior
when there was a conflict between wiki pages (the wikis would be
silently merged, which usually isn't what you want). It also didn't warn
about wiki links being broken by renames.
Position <span class="hint"> elements to the right of normal <input>
elements and underneath <textarea> elements. Fixes form hints being
badly positioned on some pages.
In production the name input is really big because the artist name
column in the production db is `text` rather than `character varying`,
and simpleform treats text columns as textbox inputs.
Instead of having custom code check whether the artist name is already
in use, just enable autocomplete on the artist name field. This is an
easier and more robust way to indicate tag name conflicts.
* Fix the artist URLs field not being prefilled when clicking
"Create new artist" in the "Fetch source data" box.
* Fix the artist name field not being prefilled when clicking
"Create new artist entry" on the /artists/show_or_new?name=<name> page.
