Simplified ItemTable constructor to accept Dimension objects directly
Simplified ItemTable constructor to accept Dimension objects directly

The dimensions associated with each heading may now be specified by
supplying dimensions as keys in the input dictionary.

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