send_channel_request_success(): new method
send_channel_request_failure(): new method
Remote_Channel.__init__(): probably incorrect attempt to increment channel id
__init__(): pass in a 'new channel class'
msg_channel_open(): construct a new channel class & send confirm
tyop
Interactive_Session_Server: fleshed out a bit
echo_server: simple server demo
go(): pass echo_server as channel constructor