A full robot vs. robot game now works between two Treos. Added UI to
choose BT as transport mechanism, and added new send proc to establish
socket connection between host and guest. Works only for two devices:
no piconet yet. No error recovery, ability to quit game in middle,
start new game, etc.
send player counts, local and expected. Based on these the relay
accepts connections, declares the game full and ready for message
forwarding, and decides whether to accept a reconnect.
scheme where cookie is used only to connect, and is replaced for
reconnects by a relay-generated name that's supposed to be unique
across all games on all relays; let relay assign non-servers' hostIDs
rather than doing 'em randomly; use hostIDs for comms-level protocol's
channelNo where possible to avoid tripping over duplicate messages
