Enable CO2 Trade (without CO2 Network)

[lindnemi]

At the moment all CO2 that is used has to be captured at the same location. In reality it will probably be traded as well. Since the co2 network might increase computation time too much, we should

• copperplate CO2 store to one single EU CO2 stored bus, and then
• unravel that bus, and account for it in the trading, just like for oil and gas