Specify queue for open requests. Resolves ##9, #78, #79 #81.

Also:
* Remove 'delete pending' flag which is not longer needed.
* Simplify some section names.
* Move the versionchange/blocked logic from upgrade steps to
  open steps, for symmetry with delete steps.
* Rename 'Authorization' section to 'Security Concerns'

Author: inexorabletash