Use ipywidgets to add a GUI inside a jupyter notebook

[vincefn]

For a general interface:

• Example of elaborate interface with tabs, and a mixture of visualisations/fit: https://github.com/DSimonne/thorondor

For Crystal viewing:

• https://stackoverflow.com/questions/44871111/how-to-run-interactive-jmol-or-jsmol-object-in-ipython-notebook
• https://github.com/nglviewer/nglview
• https://github.com/osscar-org/widget-jsmol
• https://www.blopig.com/blog/2020/06/visualising-macromolecules-and-grids-in-jupyter-notebooks-with-nglview/
• https://github.com/denphi/nanohubtools
• https://github.com/qzhu2017/PyXtal
• https://pypi.org/project/py3Dmol/ and https://github.com/3dmol/3Dmol.js/tree/master/py3Dmol
• https://pyxtal.readthedocs.io/en/latest/_modules/pyxtal/viz.html

[vincefn]

Done for a Crystal view, see: https://nbviewer.jupyter.org/github/vincefn/pyobjcryst/blob/master/examples/crystal_3d_widget.ipynb (the nbviewer won't show the widget control, just the rendered molecule)