Infaxis

[AWolstrup]

Added infaxis library to lab

[AndyGlx]

I've made quite a few changes. Please check the tutorials: there are some questions/placeholders written in them, but you can also update any bits that aren't clear, or are incorrect beyond those specific comments

[AndyGlx]

Ask on here if anything isn't clear

[AndyGlx]

FYI, you can test notebooks in colab with a url like this:
https://colab.research.google.com/github/AWolstrup/fullcontrol/blob/d38fe920573a7af057abd8736c4ae283a3301f7b/tutorials/colab/infinaxis_5axis_demo_colab.ipynb

But you'll need to import the infinaxis version of fullcontrol by replacing the beginning bit of the notebook with this:

if 'google.colab' in str(get_ipython()):
    !pip install git+https://github.com/AWolstrup/fullcontrol.git@d38fe920573a7af057abd8736c4ae283a3301f7b --quiet

[AndyGlx]

it might be nice to add a demo for mandrel printing. It's fairly clear how to set up the axes chain, but would be nice to demonstrate how the design works. For a mandrel oriented in the x direction, if you want to print a helix on it, should you define a helix with it's axis in X and the cirularish path in appox. YZ plane?