Rytis

Results 2 issues of Rytis

Improves on [#344](https://github.com/Blosc/bcolz/issues/344) Makes df -->ct-->df rountrip possible. * Added an option `index_as_columns` to save the index of a dataframe in `ctable.fromdataframe()` method. * Changed the `ctable.todataframe()` method to check...

Taking a pandas dataframe with a timedate index and converting it to ctable then converting it back to a dataframe the index values are lost. ```python df.head() bid offer time...