How do config files work?

[Kramerican]

Running the tool with the -h option lists a -c option which is "Optional path to a configuration file"

This sounds useful - however, where are the docs? What can config files do? :)

[jvoisin]

This is fixed by 02f4b9e

I reworded a bit the help: It's a custom rules file, not a "configuration" one.