Fix yScale in donut partition chart. Fix #72
Fix yScale in donut partition chart. Fix #72

The linear scale is actually implied by the comment.
However a strange scale of exp(.4) has been applied.

jprctr/Phinch,PitchInteractiveInc/Phinch,jprctr/Phinch,PitchInteractiveInc/Phinch,jprctr/Phinch,PitchInteractiveInc/Phinch