2904 graph is not getting the correct axis

[lucas-wilkins]

Plots now get their default scaling from the data given to them. Hope this is the right solution and I've not missed anything.

Fixes #2904

[krzywon]

We had something like this in the past, where the plots were scaled to the data, but this can create significant issues when a single outlying data point is loaded in. I don't think moving away from built-in MPL functionality is the right answer in this case. Instead, we need to investigate why the data set used by @XaelShan is being plotted the way it is. I have the file that triggered this and will add it to the original issue.

[lucas-wilkins]

I think that the reason is that there is a minimum range, and the data is very flat, matplotlib matplotlib centres on the range, but then its logged, pushing it to the top.

I did look at the data before doing this.

I don't see what the issue is with using this scaling method (I do remember people discussing before), I don't see how it would be problem with a single point, or with outliers - there are potential problems I can see with doing it naively, but scaling the range endpoints ensures that the range isn't zero, and that none of MPLs weird edge-of-plot cropping happens.

[XaelShan]

I believe I have another dataset that also triggers this graphing problem. I will test it again and add it to the issue.

[rozyczko]

Code looks good. Minor stylistic comment only.