Nickname verifications on registration and updates for profiles (not yet
groups) have been improved.
Minor bugs in RegisterAction were also fixed, where multiple forms would
be outputed because the function did not return after showForm(). This
will be solved more permanently with throwing exceptions in the future.
I implemented changes from quitter.se's new API that their front-end qvitter
uses, https://github.com/hannesmannerheim/qvitter/blob/master/api-changes-1.1.1/CHANGES
However I left out the URL shortening commens, since I believe whatever behaviour
they experienced that caused them to implement this was a bug (or many) and should
be fixed in their proper areas and that shortening should not be entirely left
out in API calls.
