Implement a "worm" to track file ingestion

[georgeoobrienNCAS]

When a simulation is ingested a worm showing a climbing line should appear.

[bnlawrence]

My take on this is that

• as each cycle of data from a given simulation arrives, a CFA file is updated. Then a script should run which updates this plot, which we would ideally have sitting in a web viewable place.
• The plot should show multiple worms, each ascending, with the the x-axis showing years and the right axis showing volume.
• Despite the name, it'll probably be lots of straight lines that would overlap if we don't do something cunning, so maybe each one can be offset by a bit ...