Rewrite of edit movie form - a near-identical copy of the edit photo form.
Remove Tag::item_tags($item) - it's just $item->tags->find_all().
Remove Tag::tag_items($tag) - it's just $tag->items->find_all(), and never used.
Fix item_edit_form & item_edit_form_completed events - tags work in edit forms!
Rename "Album::get_sort_order_options()" --> "Album::get_sort_column_options()".
After all, that's precisely what it is...
Update Formo config (should have no net effect on Gallery).
Convert add tag form to Formo, use "tags/add" route as sub-request in block.
Convert delete tag form to Formo.
Fix formatting in gallery.dialog.js
Simplify InPlaceEdit: remove class and view, make js create Cancel (like dialog)
Convert edit tag form (formerly rename) to Formo using simplified InPlaceEdit.
Add length rule to tag add form (now matches edit form).
Merge pull request #347 from shadlaws/fixes_20130504

Fixes 20130504