point all status change actions to Update.html

Quick actions are now routed to Display.html. It makes
harder to implement variouse extensions that require
users to fill CFs/core fields/etc when status is changed.

These quick links should fall through Update.html to
Display.html in vanilla RT and stay backwards compatible.
get rid of uninit warnings in Update.html

$Action argument is not really required
Merge branch '4.2/route-actions-via-update-page'