[Feature Request]: Toggle between total KWH and cost rather than showing both on same scaled graph

[puterboy]

Over time if KWH and cost are not the same scale (say cost is $0.20 KWH) then the magnitude difference between the two traces continues to increase linearly making it difficult to see short term changes in energy use.

For example. if:

• KWH=1, then Cost=0.20 and the scale is approximately 0 to 1, so you can perhaps perceive perhaps changes of .05KWH
• KWH=100, then Cost=20 and the scale is approximately 20 to 100, so you can perhaps perceive changes of 5KWH
• KWH=1000, then Cost=200 and the scale is approximately 200 to 1000, so you can perhaps perceive changes of 59KWH
  etc.

A way to solve this would be to only display a single trace and add a toggle between them -- this is OK since they basically say the same thing -- i.e. they are parallel lines differing only by the scale parameter $/KWH

[puterboy]

Even better/easier since assuming constant cost (which I think is all you allow), the curves differ only in scale.
So, why not just have a single curve with different Right and Left hand axis scales -- say left in KWH and right in $.