MFC: sync with KAME regarding NDP
- introduced fine-grain-timer to manage ND-caches and IPv6 Multicast-Listeners
- supports Router-Preference <draft-ietf-ipv6-router-selection-07.txt>
- better prefix lifetime management
- more spec-comformant DAD advertisement
- updated RFC/internet-draft revisions
- renamed a macro IPV6_DADOUTPUT to IPV6_UNSPECSRC
- plugged a possible memory leak
share/doc/IMPLEMENTATIONS Rev.1.9
sys/netinet/icmp6.h Rev.1.20
sys/netinet6/icmp6.c Rev.1.69
sys/netinet6/in6.c Rev.1.57,58
sys/netinet6/in6.h Rev.1.41,42
sys/netinet6/in6_ifattach.c Rev.1.31
sys/netinet6/in6_ifattach.h Rev.1.7
sys/netinet6/in6_src.c Rev.1.36
sys/netinet6/in6_var.h Rev.1.27
sys/netinet6/ip6_var.h Rev.1.36
sys/netinet6/ip6_output.c Rev.1.99,100
sys/netinet6/mld6.c Rev.1.24,25
sys/netinet6/mld6_var.h Rev.1.7
sys/netinet6/nd6.c Rev.1.59,61,62
sys/netinet6/nd6.h Rev.1.21
sys/netinet6/nd6_nbr.c Rev.1.34,37,38,39
sys/netinet6/nd6_rtr.c Rev.1.30,31
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