Feature Request: nested tables
Hi there,

I would like to see nested tables. Yes, I know, I could contribute and write it myself, but I contribute to other open source projects already.

I have this question on [Stackoverflow](https://stackoverflow.com/questions/51027339/dataframe-table-in-table-from-nested-dictionary) (All description can be found there)


which is concerning nested tables. It seems that I can not achieve exactly what I want with pandas. Maybe this is intentional, maybe not.

However, if others find it useful, maybe it can be added.

Thank you very much.
Kind regards.
Christian