| 123456789101112 |   o Infrastructure features:    - Introduce new channel_t abstraction between circuits and or_connection_t      to allow for implementing alternate OR-to-OR transports.  A channel_t is      an abstract object which can either be a cell-bearing channel, which is      responsible for authenticating and handshaking with the remote OR and      transmitting cells to and from it, or a listening channel, which spawns      new cell-bearing channels at the request of remote ORs.    - Also new is the channel_tls_t subclass of channel_t, adapting it to the      existing or_connection_t code.  The V2/V3 protocol handshaking code      which formerly resided in command.c has been moved below the channel_t      abstraction layer and may be found in channeltls.c now.
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