- check if a user is suspended, and if so return some information about
    it
  - change a users password to the given password

Removed the implementation of get_user_info, which is no longer needed now
that by default information is sourced from the database by the
authentication stuff.

PHP side.

usernames/passwords are valid. Made the encrypt_password method public, so
it can be used when changing the password for a user. Use 'self' instead of
a broken class name.

be removed.

and fixed up references to Auth_* classes.