#2 autoconfigure shouldn't be depending on configfile presence.

[Andre Koopal]

If you want the configfile only for setting presure
correction and the serial port, you loose the
autoconfiguration of sensors.

It makes much more sense to simply make this a
configfile option to switch it on or off.

Also you should be able to specify the logfile in the
configfile so there is no config at all to be set
compiletime.