Simpler layout for confusion matrix plots about cvms

[LudvigOlsen]

Hi Xavier @xgirouxb ,

This seems like a useful addition, so I'll put it on my list.
Do you need it for a project right now?

First off, this is a great package and thanks for all the work!

Thanks! :)

[xgirouxb]

Thanks @LudvigOlsen ! No rush, I usually use inkscape for all my final plot edits and enhancements so its easy to remove extra data in that step

[LudvigOlsen]

Cool!
I've implemented the feature although it might be a while before it becomes available.

Do write if you find more potential improvements :)

[LudvigOlsen]

@xgirouxb
This was added in the recent update. See the diag_percentages_only argument.