Arping 2.14

Notable changes:
* Drop privileges, where possible.
* Added ability to send unsolicited replies, instead of requests (-P).
* Quit after N replies, with -C <N>
* Beeping (-a) now works in quiet (-q) and cisco (-D) mode.
* Cisco mode (-D) now works when pinging MACs.
* Work around libnet interface autodetection bug.
* Added -W, like -w but in seconds.
* Improved error messages a bit.
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