wsp host pair

usage: wsp host pair
  a one time code another computer redeems for a token of its own, when the host
  listens beyond this computer

  --state    the state file: this word first, else WSP_HOME's state.json, else
             ./.wsp/state.json when the current directory is a checkout of wsp,
             else state.json in the home the running host serves
  --host     read to say this line runs at its own host's terminal; it dials no
             other