* In PermissionManager, if a user is anonymous but temporary user
creation is possible, grant elevated permissions at RIGOR_QUICK rigor
level. This is mostly to make skins show "edit" instead of "view
source" to anonymous users in the recommended permissions
configuration.
* Present temporary users as if they are not logged in in various places
in the interface: create/move permissions errors, login, preferences,
watchlist, BotPasswords, ChangeEmail, ResetTokens.
* Show a warning on login/logout about loss of access to the temp
account.
* On login, don't show the temporary name as a suggestion for the login
username.
Change-Id: Id0d5ffa46c3ca5c7b30d540cedbaa528b682aa85
6c1f5462f7