Handle legacy of hydrogen policy matching - re_country_load

[Eddy-JV]

This is only used in the yearly matching. Either add it tot he monthly or remove it completely if the xýearly is removed by @energyLS in a future PR that only handles yearly case.

pypsa-earth-sec/config.default.yaml

Line 37 in 2c5e83d

re_country_load: false # Set to "True" to force the RE electricity to be equal to the electricity required for hydrogen export and the country electricity load. "False" excludes the country electricity load from the constraint.