v1.2.0: Added weighting variables to correct for
- cantonal oversampling (design weight): new_weightc
- turnout bias (incl. design weight): new_weightst
- party choice (incl. design weight): new_weightp
- cantonal oversampling, turnout bias and party choice (total weight): new_weighttot
These variables correspond to the weighting variables included in the Selects cumulative dataset.