$user: user object being loaded
&$result: set this to a boolean value to abort the normal authentification process
-'UserLoadFromSession': called to authenticate users on external/environmental means; occurs after session is loaded
+'UserLoadAfterLoadFromSession': called to authenticate users on external/environmental means; occurs after session is loaded
$user: user object being loaded
&$result: set this to a boolean value to abort the normal authentification process