- Move controls to the "controls/" directory
- Make controls interface look similar to each other
- Prefix "private" methods and attributes with underscore
This is to let user log in if their login cookie is broken (for example
when it refers to a non existing user). Normally, the client should
treat errors caused by cookie logins as temporary server failures,
inform the user about it and leave the cookie, so that when the server
is up again, all user needs to do is to reload the page rather than
logging again.
