Add check for fully qualified IPv4 and IPv6 Domains

[Stoneagerock]

Add a check for *.local AND valid ipv6 address ANDOR ping a valid ipv6 address (either ipv6.arpa. or a user-selectable one).

Hopefully that will resolve some incompatability with ARM-powered devices since Bonjour got patched last year by Apple.

[pemensik]

I am not sure what you report here. For IPv6 queries to work, /etc/nsswitch.conf has to contain mdns, mdns_minimal or mdns6_minimal. Depending on your distribution, it might not be enabled by default to search also for IPv6 addresses. But current implementation is lacking and has some issues when both address families are searched. I reported it in issue #83.