split ONONSPEC from IEA Energy Balances between all demand sectors

[robertpietzcker]

for some unknown reason, all energy that is not attributed to a sector in the Energy Balances got previously attributed to residential.

I think we would get to a more robust solution if we aggregate all the sectoral FE per carrier and then distribute the ONONSPEC equally to all demands for a certain FE carrier - so that if ONONSPEC-Liquids makes up 5% of all sectoral liquids FE demand, both transport, buildings and industry FE liquids demands get increased by 5% - and not, as is now the case, buildings liquids demand gets increased by 30%

this would require some additional correction in the production of the FE values from the IEA energy balances - I can describe the required algorithm, but I cannot implement it.

@fbenke-pik would you be able to do this?