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Changes mostly related to the C++ part that is in a preliminary release (not completed, but simple plots can already be made with it). It also contains some fixes and minor improvements (mostly for readability) to the python version, including the full compatability with python 2.7 (hopefully!) by removing all f-strings that were mistakenly left last time.
I have also implemented a workflow that should trigger at push and when opening a pull-request (testing this now :)). It just perform some basic checks on the software to prevent obvious programming mistakes. It checks the C++ compilation within ROOT and the python code (in both 3.X and 2.7).
Finally, I have added a few example codes in the tests directory. Mostly for internal checks, but I guess people can get ideas on how to use the code with working stand-alone examples (histograms and built-up on the fly).