Counter & visitor statistics

This version is a replacement of the old count_visitor class. There are lot of good systems like this class but most of them are really complex and difficult to modify. You have to use this kind of systems like provided. This class is not an alternative if you look for the same amount functions, but it's a light weight solution to integrate into your website. In the last version (2.02) I added a new top list with the number of visits grouped by the domain name from the HTTP referer information. In version 2.03 it's possible to show the daily average number visits inside the monthly visitors table.