o Minor features (configuration, controller):
    - Each of the *Port options, such as SocksPort, ORPort, ControlPort,
      and so on, now comes with a __*Port variant that will not be
      saved to the torrc file by the controller's SAVECONF command.
      This change allows TorBrowser to set up a single-use domain socket
      for each time it launches Tor. Closes ticket 20956.