* Nodes report their local hostname in the URL. Optional of course.
  Stick that in as the nickname so its easier to see where a wa/ron
  node actually is.

* As of version 3, the CDROM no downloads the entire register.pl
  script. The old script is just a wrapper that asks the page for the
  real script, which is run on the node. We return a url and md5 in
  the response, which the node then gets with wget. Right now the md5
  and the url are hardwired in the page, and the script goes in
  /z/testbed/distributions on boss. Needs to be DB loaded instead.

* Return the slice in which we want to place the extrafs (/users)
  instead of trying to guess one. Since we return an fdisk table and a
  set of slices, we know what the setup is going to be anyway!