to returing values for string keys so adding a new config doesn't mean
modifying that class. Then add new config for addr passed to bind so
relay can be run to accept http connections from remote machines.
change the set listened on. There's still some debugging to do but
nothing that worked before is broken. Also begin to accept unique
prefixes (e.g. g for get) for commands and attributes on the control
port. Note that relay-related code in comms seems broken now, but is
without this checkin.