Switch to widescreen for moderation

Also: fix bugs with toggling white redaction global state, and drawing
user selection highlights as buttons.
Fix user-state views in detail and compact
Add sticky metadata editor; clean up dispatcher

The dispatcher wasn't explicitly calling "remove" on views, giving us no
way to disengage global events.  We created global events to implement
the "sticky" metadata editor (emulating the
as-yet-unsupported-by-browsers "position: sticky"), so refactor dispatch
to properly clean those up.
Show doc type in editor title
Add 'stow' button for metadata; pagination fix.

Add a button which pushes the metadata editor out of the way.

Hide empty pagination optionally by an instance property on the base
paginated view.
Fix ready-to-publish days
Set selenium window size on load