Deal with hydrogen derivates from pypsa-eur

[ClaraBuettner]

Pypsa-eur considers hydrogen derivates (e.g. naphtha) that are needed for industry, aviation and shipping transport.
In our tools, we don't see these demands. We should somehow implement the hydrogen demands in our tools to not underestimate the hydrogen demands. Therefore, changes in powerd-data might be necessary.

One option I could imagine:

The hydrogen derivates are produced by the link "Fischer-Tropsch" which connects hydrogen with oil. This link exists for each country. So we could take the loading p0 of this link as an additional hydrogen demand in our model.