Set up web log analysis tool

The goal is to set up web server log analysis for daily processing of all web server logs (www, blog, trac, and so on). This all started with #2489 (moved) Set up new web server logging and log analysis infrastructure.

Karsten is analyzing and sanitizing the logs that we have, and I'm going to research tools we can use to display the logs in a user-friendly way.

Suggested tools are AWStats and Piwik. I'm sure there are more tools out there as well.