add option for data to bypass the matching process

[lkstrp]

Ref #165

As a future TODO: Going from 1000 kW threshold to 50 kW threshold or even lower would have a large benefit for the total of the solar capacities in Germany closely matching those from https://openenergytracker.org/docs/germany/electricity. Maybe we can add a config that certain (parts of) data sets that are marked as "fully included sources" are not included in the matching process.