add the possibility to change the graphing style (line or area and its color) directly from the configuration file.
renamed the default configuration file so that changes to this file do not interfere with updates coming from the repo.
Pull request contributed by Olaf Peters (http://magicolf.de)
- When creating a new rra for traffic data, the maximum line speed is queried from the router and used as a valid upper limit. This avoids spikes in the traffic graph originating from traffic counter resets on reconnects.