Zabbix

[DEV-23] improvements in configure.in IPv6 (Sasha)
[DEV-23] Autodiscovery for IPv6 (Sasha)
[DEV-17] Add support of IPv6 to standard library (comms.c) (Sasha)
[DEV-21] extended size of IP fields to accept IPv6 style IPs (Alexei)
[DEV-21] added basic validation of IPv6 IP addresses in GUI (Alexei)
[DEV-18] Modified structures of include/db.h to have larger length for IP addresses.
[DEV-18] database schema enhanced for IPv6 addresses (Alexei)
Minor fix for confgure.in.
support of --enable-ipv6 for configure.in (Alexei)