Added Spread and ErrorBars Table conversions
Added Spread and ErrorBars Table conversions

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