Results UI: choose which variable gets colored.

```
Right now, of all the variables, it is always "Run" that determines the color
of a bar. It would be useful to be able to choose any other variable (vm, or a
parameter, etc.). Optional: what if I choose two variables, and I get MxN
different colors? (still just arbitrary colors.)

(A crazy thought for the future would be being able to set color by one
variable and shading by another variable at the same time.)
```

Original issue reported on code.google.com by `kevinb@google.com` on 16 Jul 2010 at 2:19