Updating the default dataset may have double counting in Hard Coal

[irm-codebase]

During some testing, I re-ran the default configuration:

plants = ppm.powerplants(update=True)

The resulting dataset is similar to the documentation, except for a big increase in Hard Coal facilities:

The seems like the statistics are from 2018(*?), but I doubt that Europe had such a massive increase in coal facilities in the last half decade... Maybe some double counting is happening due to changes in one of the source datasets?