* Select through debconf if we install rapid-tunneling user as uid 0 or 
  not.

  If we do, we must use the current useradd command. If we don't: use 
  adduser. The web interface only assumes that there's such a user.
* Do we delete users on purge?
* A symlink under /var/www is only good as a quick hack. 
  According to the draft webapps policy we should not rely on /var/www/ 
  to be the web root. But this means that the package will not work out 
  of the box. Anybody who I asked seems to dismiss this issue. I don't.
  http://webapps-common.alioth.debian.org/draft/html/ch-httpd.html#s-httpd-register-symlinks