o Minor features:

    - Report flags that control a circuit's path selection to
      controllers in CIRC events and in replies to 'GETINFO
      circuit-status'.  Implements part of ticket 2411.

    - Report the current state of a hidden-service-related circuit to
      controllers in CIRC events and in replies to 'GETINFO
      circuit-status'.  Implements part of ticket 2411.