Updated number handling on charts

On all of the charts right now in-app, the axes numbers are overly specific. I think they would be better if the increments were round. We should also consider which charts should be forced to start at 0. For example on the following plot, the y-axis should probably start at 0, and then have increments of 5000, 10000, 15000. To me it is distracting and conveys false precision to have the non-rounded numbers.