Bug: resizing the tag edit dialog then expanding the related tags
section doesn't resize the dialog to fit the expanded related tags
section. Instead a scrollbar appears.
Fixes this by expanding the dialog's height when the related tags are
shown.
* Autocomplete the `search:<label>` metatag.
* Make label autocompletion do a prefix match instead of a substring
match. Example: `search:ar` matches `artists`, not `characters`. This
is how tags and most other things are autocompleted.
Bug: in edit mode, each time you click a thumbnail the height of the tag
edit box increases by 4px.
This is due to `scrollHeight` including vertical padding. Fix it to a)
ignore this padding, and b) ensure the min height is at least 80px.
* Fix routing error in respond_with (didn't use /moderator namespace).
* Fix /moderator/posts/approvals.json response to return full
PostApproval object, not just a success/failure message.
* Simplify the javascript a bit (use $.post instead of $.ajax).
`Danbooru.Post.approve` is used for approving posts via the mode menu.
It doesn't hide all the notices or the approve/disapprove/flag buttons.
Click the link instead to hide those things.
Click the #quick-mod-approve link instead of #approve because #approve
prompts for confirmation.
Mark all tag <input>s with a `data-autocomplete` attribute, instead of
hardcoding a list of html IDs to autocomplete in javascript.
This way should be less error prone. It fixes autocomplete in several places:
* Autocomplete for the search box on /posts didn't work in the
responsive layout. This was because /posts has two search boxes that
both have the id `tags`: one in the normal sidebar, and one in the
responsive tag list. $("#tags") only initialized autocomplete on the
first one.
* Autocomplete didn't work on the aliases or implications pages. This
was due to selecting the wrong html ids.
