(In [4533]) fixes #1111 - add support for IPv6 addresses (tracking, anonymization, and exclusion)
fixes #2095 - add new anonymization hook (pre-heuristics)
fixes #2055 - optional IP filter when multiple proxies present
fixes #1775 - SitesManager: supports CIDR notation for IP exclusion
Notes:
select inet_ntoa(conv(hex(location_ip), 16, 10)) from piwik_log_visit;
(In [4536]) fixes #2351 - use LGPL PHP_Compat_Functions