BUG: unstack() sorts automatically, default is preferably unsorted?
The unstack() function is automatically sorting my labels in my boxplot-code. Isn't it nice to have a sort = False option (probably the default?)

My labels are perfectly ordered, it's just after unstacking they get messed-up.

my post on stack-overflow: https://stackoverflow.com/questions/61720090/issues-with-boxplot-figure-x-label-are-alphabetically-and-extra-nan-label-is-cr

another example: https://stackoverflow.com/questions/32163063/pandas-plotting-incorrectly-sorts-the-binned-values-on-the-graph
