Cleanup remnants of BrowsePoll; update packaging

- Actually cleanup everything from when we used to BrowsePoll
  against cluster-printers.mit.edu (Trac: #1473).  This entails
  punting the transform script, the restart code, and the site
  config file.
- Drop CDBS and switch to dh7, adding a .undisplace file.
- Update the copyright file to the new file format
- Drop the build dependency on cups, cdbs, and dh-buildinfo
- Remove the disjunctions in the Depends field, because it's not
  2008 anymore, and nobody has anything called cupsys installed.