[Sprint/CleverChipmunk](bug): Adding in auto-complete username & password

This actually does NOT fix minds#297 (closed). Had a good play with it and cannot work out what is going on - the browser should recognise that the autocomplete="username" field should not contain a password, but it doesn't, unless you click down in the password field and then it fills out normally.

I would recommend to the user in question to use a password manager like KeePass, or if less bothered about Open Source, 1Password / LastPass, as storing your passwords in browser is quite an insecure practice in my opinion.

Works fine with 1Password which I've tested, already did, but added these because they're considered good practice to have in login forms.