Change config file behavior.

[nedyarrd]

I see a little glitch in config parsing, because I think it is impossibile to read holding and input registers when both of them share that same adress. In Afore inverters every data begins with 0 address at input register 1 means Urs voltage, but at holding register it is a HMI version used in inverter. Maybe it would be good to rethink configuration file and parsing it. I think json would be easier readable and foolproof ;-)