add back UI features with pyqt again

When doing so, to maintain a proper backend support with use of gui in jupyter notebook without having to call 
``%matplotlib inline`` everywhere, this guy seems to have found a good trick : 
[change-matplotlib-backend-temporarily-locally](https://stackoverflow.com/questions/69658265/how-to-change-matplotlib-backend-temporarily-locally-for-a-function-in-jupyter)