Gini and Theil classes as top-level in namespace?

[jGaboardi]

We are currently populating the top-level namespace with access to the Gini & Theil classes as inequality.gini.Gini, for example. I would like to propose adding the classes themselves to the top-level namespace, e.g.:

from .gini import Gini

This would help distinguishing between the class offering of Gini & Theil and the functional indices in _indices.

xref #31

[jGaboardi]

Probably best to start with a FutureWarning that the namespace will change, even though only slightly.

[jGaboardi]

@martinfleis Do you have any input on this since momepy is using both Gini and Theil?

[martinfleis]

We have it as optional dependency with imports as from inequality.theil import Theil so I don't mind if I do that or from inequality import Theil

[martinfleis]

If the merge with segregation will happen, I would follow whatever model is there.