4401. [misc] Change LICENSE to MPL 2.0.
added print.h includes, updated copyrights
2734. [port] cygwin: arpaname did not compile. [RT #20473]
- fix windows build of ddns-confgen - fix unix build of arpaname
add config.h
2571. [func] Add a new tool "arpaname" which translates IP addresses to the corresponding IN-ADDR.ARPA or IP6.ARPA name. [RT #18976]