piwik/piwik — pull request #13 by MatenViro (2012-11-05 10:58:07+00:00)
Title: #3517 / Fix Referer plugin to correct calculating of visitors uniqueness

Patch to fix a ticket 3517.
Fix incorrect count of unique visitors in all referrers reports.
Around two times better performance of method Referers::archiveDayAggregateVisitors