for the near future. Two big changes:

* Add WikiOnly accounts. An external user can register for an account on
  the wiki. Rather then use the registration stuff that comes with TWiki,
  redirect to new Emulab web page so we can manage all of the wiki accounts
  from one place. I modified the joinproject page to spit out a subset of
  the required fields so that its simple to get a wiki only account (just a
  few things to fill in).

  In keeping with current security practices, we still generate a
  verification email message to ensure the email address works. However,
  when the user completes the verification, the wiki account is created right
  away, rather then waiting for someone to approve it (since that would
  defeat the entire point of the wiki).

  Aside: I have not thought much about the conversion from a wiki-only
  account to a real account. That is going to happen, and it would be nice
  if that step did not require one...