TO-DO

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Features

 - Display min/avg/max RTT (in keeping with the above)
        - some arguments here because the non-avg is valuable too
 - VJ-type UDP tracing for comparison (maybe)
 - lookup whois and dns info in background thread
 - select interface via CLI by IP address


KNOWN BUGS

whois.c:  the w_lookup_* functions take too long to time out