Only show changed URLs in the artist history, not unchanged URLs. Makes
the edit history more compact and easier to read by showing only the
things that changed on every edit.
- The types are:
-- Previous: The default and the previously used type
-- Subsequent: Compares against the next version
-- Current: Compares against the current version
- Allow switching between comparison types in index and diff views
-- Have links vary depending upon current comparison type
- Diff view changes
-- Only show pool description changes in diff view
-- Conditionally render diff link when applicable values are changed
-- Conditionally show diff view sections when values are changed
- Show renames on index view
-- There is plenty of space
-- This wasn't shown at all for wikis
-- Having to navigate to an alternate page is unwieldy for pools
- Show "posts" as a status on pools
-- This is so all changes among versions are quantified as a status
- Standardize diff/index titles
- Added a changes column explicitly listing all of the changes
-- This makes it more in line with the other version views now
- Does a symmetric difference on the array fields to detect changes
* 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).
1) Put `<script>alert("xss 1")</script>` in the Other Names field in an
artist entry.
2) Put `<script>alert("xss 2")</script>` in the URLs field.
3) Trick someone into the viewing the history page for that artist.
