If a pending post is manually deleted before the 3 day moderation period
is up, then make it cost 5 upload slots until the 3 day period is up.
This means that if a new user uploads 3 bad posts that get manually
deleted, then all of their upload slots will be used and they won't be
able to upload again until 3 days have passed.
* Include appealed posts in the modqueue.
* Add `status` field to appeals. Appeals start out as `pending`, then
become `rejected` if the post isn't approved within three days. If the
post is approved, the appeal's status becomes `succeeded`.
* Add `status` field to flags. Flags start out as `pending` then become
`rejected` if the post is approved within three days. If the post
isn't approved, the flag's status becomes `succeeded`.
* Leave behind a "Unapproved in three days" dummy flag when an appeal
goes unapproved, just like when a pending post is unapproved.
* Only allow deleted posts to be appealed. Don't allow flagged posts to be appealed.
* Add `status:appealed` metatag. `status:appealed` is separate from `status:pending`.
* Include appealed posts in `status:modqueue`. Search `status:modqueue order:modqueue`
to view the modqueue as a normal search.
* Retroactively set old flags and appeals as succeeded or rejected. This
may not be correct for posts that were appealed or flagged multiple
times. This is difficult to set correctly because we don't have
approval records for old posts, so we can't tell the actual outcome of
old flags and appeals.
* Deprecate the `is_resolved` field on post flags. A resolved flag is a
flag that isn't pending.
* Known bug: appealed posts have a black border instead of a blue
border. Checking whether a post has been appealed would require either
an extra query on the posts/index page, or an is_appealed flag on
posts, neither of which are very desirable.
* Known bug: you can't use `status:appealed` in blacklists, for the same
reason as above.
