Optional 2nd y-axis for Weight curve

[metawops]

Is your feature request related to a problem? Please describe.
When I activate the Weight curve the other curves (Flow and Weight Flow) get squashed together and are now barely visible.

Describe the solution you'd like
If the Weight curve could be displayed on a 2nd y-axis (at the right side of the diagram) in its own scale we could still see the Flow and Weight Flow curves – together with the Weight curve, still (and better) comparable.
This could be implemented as an option that could be switched on or off.

[miharekar]

Thanks for the suggestion! That's an interesting idea, indeed.

Unfortunately, I don't have the time or the in-depth knowledge of Highcharts to implement this feature myself. However, I'm always open to contributions from the community. If you or anyone else would like to take this on and submit a pull request, I'd be more than happy to review and merge it.