[WIP] allow passing list of variables to [check_]aggregate[_region]()
functions
#306
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Description of PR
This PR allows to pass a list of variables (rather than only single variables) to any function of the aggregation tools.
The PR is directed into
IAMconsortium:feature/aggregate_weights
to highlight the differences of the aggregation-features to that prep-work - I'll rebase after a first round of review and merging of #305.