Include more data

[jgmill]

• French renewable generation from RTE. Data only starts in 2015 unfortunately

• Spanish renewable generation from REE

• Austrian wind and solar generation from APG starts 2010

• Austrian wind generation fomr Ömag starts 2003

• Finnish wind generation from Fingrid

• Italian renewables generation from Terna

• UK renewables generation from Elexon

• German and Nordic day-ahead spot price data in DKK from Energinet.dk

• Load Data for Nordic countries before 2010

• Load data from new ENTSO E Power Statistics