Update plotting script to include xkey and ykey

[dmadeka]

@heiner Solves #257

Taken from here

[dmadeka]

Not sure whats happening with flake8 here:

In [1]: a = "float,float. range of y values to plot. overrides automatic zoom for y axis."                                                                                                                         

In [2]: len(a)                                                                                                                                                                                                     
Out[2]: 76

[heiner]

Line 37 I believe.

[dmadeka]

Strange, running flake8 and black didnt show either error. Fixed.

[dmadeka]

unclear the failing tests are related to plot.py?

[heiner]

Yes this is obviously a flake (although I'd like to know what the underlying issue is, there's no way to get at that now).

I'll review and merge tomorrow.

[dmadeka]

Ill try look into it on my mac tonight -

Looks like the quit isnt really working

[heiner]

Generally looks good, three small comments below.

[heiner]

Looks good, thanks!