wip/ncp 1.2.4 NetBSD

npush will now use IPv6 and IPv4 multicast on the multicast groups ff02::6e63:7030 (6e63:7030 == 'ncp0') and 224.110.99.112 (110.99.112 == 'ncp'). If both methods fail, npush will resort to the broadcast packets used by previous versions. You can force the broadcast method by passing "-b" to npush so that previous npoll versions can see the announcements.

"ncp" is a utility for copying files in a LAN. It has absolutely no security or integrity checking, no throttling, no features, except one: you don't have to type the coordinates of your peer.