- bugfix: control endpoints can't stall
      - bugfix: remove bogus intr unlink optimization,
          by sharing intr/iso code
      - bugfix: iso submit uses urb->interval
      - removed iso urb->next ring logic
          (belongs in hcd layer if anywhere)
      - simplify/shorten/correct completion handling
      - in debug, labels setup packets as such
      - bring CVS ids back up to date