* (bug 12567) Fix for misformatted read-only messages on edit, protect.

* (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.