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Fix bug in chi2 bar plots

Emanuele Roberto Nocera requested to merge barplotbug into master

Created by: Zaharid

The ordering of the columns was not guaranteed to match the order of the categories we infer (i.e. for the legend). The issue is, as way too often, the handling of pandas MultiIndexes. The 'levels' property stores the unique values in each levels, but they are not guaranteed to be ordered in any way. Order is recovered by using the 'labels' property.

See: https://stackoverflow.com/a/24489283/1007990

Instead we get the values for all the atomic columns and select the unique items, which should correspond to fit names.

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