Added initial support for dataframes on NdElement types
Added initial support for dataframes on NdElement types

vascotenner/holoviews,mjabri/holoviews,ioam/holoviews,ioam/holoviews,ioam/holoviews,vascotenner/holoviews,basnijholt/holoviews,mjabri/holoviews,basnijholt/holoviews,vascotenner/holoviews,mjabri/holoviews,basnijholt/holoviews