Wishlist for sns.qqplot

[mwaskom]

These exist in statsmodels but they are aesthetically inflexible and don't ( to my knowledge) do things like smart labeling of axes. Also, I don't think they work that will in an axis grid context.

[phobson]

I wrote that and it's a mess b/c I think they wanted it to be too flexible. Happy to take a crack at a simpler, more functional form.

The main trick I've since discovered is defining a proper matplotlib scale.

~~https://github.com/phobson/statsmodels/blob/bug-probplot-fixes/statsmodels/graphics/_probscale.py~~

Better link: https://github.com/Geosyntec/wqio/blob/master/wqio/utils/probscale.py