EnergyCarrierTypeValues - need Fernwaerme

Created by: anetefr

If in real data there is energy source fernwärme, there is no place where to properly map it in enumeration EnergyCarrierTypeValues. I image that fernwärma will appear quite often in data. It could be added to enumeration. However, then mandatory nature of "co2EmssionFactor" and "primaryEnergyFactor" might arise problems then.