Finalize the set of examples

[sophiemiddleton]

The initial pyutils examples were .py files. This makes then easy for everyone to use no matter what platform.

Although I like notebooks, opening a notebook on the mu2e machines is a multi-stage effort whereas opening a .py can be done in any editor.

I would advocate for both to suit all audiences.

Personally I have no disk quota to even be able to open a notebook on the mu2e machines so will make my examples .py files.

[sophiemiddleton]

I have started this in my last PR. I think actually maintaining both notebooks and scripts makes sense. The notebooks allow for proper introduction of the concepts and the scripts are there just for people who prefer those.

Once the issues currently being worked on are resolved I'll update all the examples