Integrate Abroad H2-Buses into H2-grid

[lenzim97]

The current Model of the H2-grid just consider the national H2-grid-Infrastructure based on the Wasserstoffkernetz from FNB-Gas (https://fnb-gas.de/wasserstoffnetz-wasserstoff-kernnetz/). In the Data from FNB-Gas there are some H2-Pipelines which leads to neighbour countries, but this connections are not considered yet.

So for modelling the H2 transfer to foreign countries the H2 network must be expanded by new abroad h2-buses, connections of the german h2-grid to these buses and connections between the abroad buses among each other.
The capacities of the abroad pipelines could be taken out of the parameters from the data of FNB-Gas or from data of european hydrogen Backbone.