Option to scale images to same range across multiple models

[aangress]

Currently, images are normalized according to their individual extrema. I'm attempting to implement a utility function that calculates a global vmin/vmax that you can use in MultiModelPlotters to normalize across all images using the global values. WiP

[aymgal]

Hi @aangress , thank you very much for your implementations! This looks really great. I will do my very best to review this by the end of this week (I'm quite busy these days, sorry!). Hope this is fine by you (but don't hesitate to open new pull requests in the meantime if you like).

[aymgal]

@aangress Looks mostly good, I just have a few comments:

• It would be better to have explicit keyword arguments to the function, instead of **kwargs. It would make it easier for the user to use the function, and simplify the code as well. I am not sure to follow the need for del statements for instance, and perhaps having explicit kwargs would remove the need for this?
• Could you write the docstring in the same format is in e.g. this code ("Numpydoc" style)

[aangress]

@aymgal Just addressed your comments. I also added the function to notebook 04 for the model comparison as I figure this is a pretty good way to show the functionality. Let me know if it all makes sense!

[aangress]

@aymgal Fixed conflicts!

[aymgal]

Thanks @aangress !