Show units on graphs in Electric Network Info Window

[Roxor128]

A short and simple request: Show units on the graphs in the Electric Network Info window.

Being able to read off just how much that peak when your laser turrets were shooting was would be useful for planning how much more to build.

Given how high the graph is, I think just three or four levels, counting zero, would suffice. Maybe make it user-configurable, just in case anyone would like more or less detail.

[Jap2.0]

This would be nice - numerical data is always useful. A few evenly distributed would be nice, but if you want to do more you could give us a number when we hover over a point on the graph, and show us things like peak, 90th percentile, 10th percentile, mean, etc.