At present the ?page= in the URL isn't affected, which could possibly
confuse users - maybe move to having the page variable as a POST variable
so the url is just always /i2ptunnel/wizard

This means that the form is handled by the same handler as the edit
forms, hopefully reducing maintenance ^_^

The idea is to utilise the existing saveChanges function in IndexBean.java
that the edit page posts to. Consequently, the wizard will need to have all
the same inputs that need to be POSTed as the edit page does.