Label condition dots

[mccalluc]

There's plenty of room... let's just have the points of the conditions scatterplot labelled by default: Hover shouldn't be required.

[mccalluc]

Here are the docs that made me think it might work: https://plot.ly/python/text-and-annotations/
... but the scattergl is not quite at feature parity. In particular: plotly/plotly.js#130 (comment) :

scatter mode: 'text' (for text charts) is not available

(And, fwiw, annotations are something different, but since they go in the layout, I feel like that might get confused.)

[mccalluc]

Oh, but we don't need to use gl for the conditions plot!: We're dealing with a much smaller number.