JSChart TODOs

[juberti]

• Hover/tooltip is done as well as it can be for this version, I think. There is an optimization to get rid of the bsearch, but I'll think about that more and it is probably easier for me to do it than to ask you.
• The x-axis labels are not right, we should probably step away from treating this as time series. However, when I tried other stuff a few weeks ago, the whole thing went haywire. That would be one point where I could use your help.
• The other one is that ChartJS does not have built-in zoom and pan, and we will have to engineer something like click and drag for it, because it would be a shame to not have that.
• There is also a setViewport function in visualization.js that doesn't have logic for chartJS, that needs filling in. This seemed relevant: https://stackoverflow.com/questions/43905749/chart-js-linechart-how-to-show-only-part-of-dataset-and-support-horizontal-scrol
• If we want to get hover useful in live display before they ship version 3.0, we would have to fix the bug ourselves and host our own version.

[gunnarmein]

Once you write setViewport, you will see how screwed up the x-labels are.