Fix login process

[r-a303931]

Improved the login process by:

1. Adding banners and disabling buttons to prevent multiple successive username and password reset requests - page reload between requests now required
2. Trimming usernames everywhere to handle people adding spaces to their names
3. Made password reset error out when people reuse old passwords instead of silently ignoring the error
4. Upped the password minimum password length from 8 to 11...
5. ...but also removed max password age