Improve regional electricity demand distribution

[fneum]

Use 🇪🇺 JRC Energy Atlas for EU27 which resolves demand on 1x1 km raster:

https://energy-industry-geolab.jrc.ec.europa.eu/energy-atlas/

https://publications.jrc.ec.europa.eu/repository/handle/JRC136080

https://jeodpp.jrc.ec.europa.eu/ftp/jrc-opendata/EIGL-Data/RASTER/

Default to current distribution for other countries.

🇬🇧 https://www.gov.uk/government/statistics/regional-and-local-authority-electricity-consumption-statistics

🇳🇴 https://www.ssb.no/en/statbank/table/14092 (by price area)