Bettah Bar Charts

#1301 Should fix the extra characters that come up in at saved vis.

Turns off data point id for y-axes by default.
I thought about this myself. I came to the conclusion that for most data sets, more than 20 colors is going to make things difficult to distinguish by color anyway. In this light, 20 or 30 colors is not so different. Fewer colors also means the  colors themselves are more distinct.

Overall, I think that general purpose analysis, 20 is OK reduction. Especially since the color picker allows you to set your own for data sets with > 20 series.