Change calling convention to explicitly indicate whether the attributes
are for the <th> element or the <td> element. Fixes various cases where
the two were mixed up.
* Fix .col-expand classes not being set correctly on the /post_versions,
/pool_versions, and /notes pages.
* Fix .updater and .updated-at classes not being set correctly on the
/forum_topics page.
* Fix the name param being ignored (noticeable in the post count field
on the /tags page).
* Don't pass empty string when column has no name.
* Add search form above table.
* Move thumbnail to left of table when viewing history of single post.
* Remove unrelated links from subnav menu.
* Fix bugs with changed_tags search.
* Add thumbnails to /post_versions (when viewing history of a single
post, thumbnail is above table rather than in every table row).
* Combine user, date, and ip address columns into one column.
* Remove rating and parent columns (rating and parent changes are
already listed in the tags column).
post_version.post.versions.first.id caused an extra query for each post version:
SELECT "post_versions".* FROM "post_versions" WHERE "post_versions"."post_id" = $1 ORDER BY updated_at ASC, id asc LIMIT 1
