Made OverlayPlot title and legend more robust
Made OverlayPlot title and legend more robust

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