Add a Percent Target for temperature chart [FR]

[arne182]

The idea is that instead of having a few different temperature targets on a graph that is going from 0°C to max °C.

You could rather have it show the target temperature as 1.0 and vary the scale to show the amount of variation there is to the Target temperature. So that would mean instead of

You have the two curves much closer together and are able to see how well the PID is for your heater.

[arne182]

Something like this. Which shows much clearer that the heater bed has times where it is 1.5°C over the target temperature.

[alexhocks]

Generally, I like that idea. But only as an option. Please leave the current view as default.