* Added a new category
* Add deletion support to batch tag updater
* Bug fixes

Tenboro said to

Also hide some who-did-this information from normal users

Requires database change
Invalidates caches

Analysis has shown that this system doesn't actually accomplish
anything. Users do not vote on tags often enough to actually get any tag
removed, so why even bother?

Non-critical database change with this commit

These features only have any value if users actually use them, and
experience has shown that nowhere near enough users use them to make
them worthwhile.

This was an automatic mass-replace. Manual replacement of array(...)
will continue

Fixes #27

Adjusted the autofill so that it should use the first page of the gallery as the cover.
Falls back to the old thumbnail if it breaks.