Pull up following revision(s) (requested by roy in ticket #390):
sys/netinet/ip_input.c: 1.363
sys/netinet6/ip6_input.c: 1.184-1.185
sys/netinet6/ip6_output.c: 1.194-1.195
sys/netinet6/in6_src.c: 1.83-1.84
Allow local communication over DETACHED addresses.
Allow binding to DETACHED or TENTATIVE addresses as we deny
sending upstream from them anyway.
Prefer non DETACHED or TENTATIVE addresses.
--
Attempt to restore v6 networking.  Not 100% certain that these
changes are all that is needed, but they're certainly a big part of it
(especially the ip6_input.c change.)
--
Treat unvalidated addresses as deprecated in rule 3.

(snj)