Histogram view

[JosephBond]

In order to make examples convincing we will need to be able to plot a histogram of data-points.
Structurally this is similar to a bar-chart, but where the “categorical” axis labels represent bins that coarsen the data into chunks of (not necessarily equal) widths. We also want to plot the inter-percentile range over the top of this histogram

[rolyp]

@JosephBond Dropping this from In Progress to Planned for now (perhaps that was your intention).