Log Message:
Update to libirman-0.4.1bnb2
    Fix default serial port to be ${DEFAULT_SERIAL_DEVICE}
    Drop 'test_' prefix on test_irman_{name,io,func}, and call
    setlinebuf(stdout) so they are usable when piped to an interactive
    program.
    Mmmm, fixes to libirman and mserv in the same day. Can they be related? :)