o Remove configuration option (confic):
    - AllowInvalidNodes was deprecated in 0.2.9.2-alpha and now has been
      rendered obsolete. Code has been removed and feature no longer exists.
    - AllowSingleHopCircuits was deprecated in 0.2.9.2-alpha and now has been
      rendered obsolete. Code has been removed and feature no longer exists.
    - AllowSingleHopExits was deprecated in 0.2.9.2-alpha and now has been
      rendered obsolete. Code has been removed and feature no longer exists.