* (bug 12567) Fix for misformatted read-only messages on edit, protect.
Also added proper read-only checks to several special pages.
Have removed read-only checks from the general user permission framework
since it doesn't belong there; user authorization is independent from
the database's read-only state, and the way we check and present error
conditions is necessarily different. Further, as a detail it was formatting
the actual message incorrectly as an inline message when historically it's a
big block message with tables and images and stuff.