0.11-stable: Added a notice to the "403 Forbidden" error page for unauthenticated users suggesting that the user should log in.
Closes #5340 as per [GoogleGroups:trac-dev:2e8be2a89307f7ce this message].
Authored by: rblank 2008-08-22
Parent: [r7493]
Child: [r7495]
