Start with cgi graphing.

For now it just sets the option in munin.conf. It is still missing the apache/nginx part of the config to enable the cgi-scripts.
Fix the cgi-mode to generate html and graphics

For apache2 as server, this configures apache2 to generate html and graphics by cgi.
Another attempt at getting cgi working

A bit simplier then before, hopefully better then before. Creating html and graphs from cgi.