TapQueue server and station 0.14.0

Added

• People can delete a job they've already released, not only a held one (from the tray app's
  My print queue, client 0.10 on). The server asks the printer to stop it and gives back the
  pages that didn't print: all of them if the printer hadn't started, the rest if it was part way
  and says how many it printed. A printer that had started and doesn't say gives nothing back.
  Page limits and reports count what's left, and the job's page in the console shows what was
  given back. Only jobs released from this version on can be stopped: the server has to have kept
  the printer's number for the job.
• GET /api/v1/queues for the tray app: the queues the signed-in person may print to, as they
  are now rather than when they signed in.

Changed

• Deleting your own job (DELETE /api/v1/me/jobs/<id>) now answers 200 with what happened
  instead of an empty 204. Older tray apps don't mind.
• The database moves to schema 17 (a backup is made first, as always).