allows users to reorder layers (broken for timeseries, temporarily)
allows users to reorder layers (broken for timeseries, temporarily)

neurodata/NeuroDataViz,openconnectome/NeuroDataViz,neurodata/NeuroDataViz,neurodata/NeuroDataViz,openconnectome/NeuroDataViz,openconnectome/NeuroDataViz