Installation of WebIO Jupyter extensions in central installation

[oschulz]

I often deal with environments in which a central read-only Jupyter installation is shared between many users, either on a cluster file system or via software containers. Is there a reliable way to install the Jupyter-Notebook and JuypterLab WebIO extensions up front?

[oschulz]

This would also help a lot in situations where a JupyterHub is used (provided by more and more computing sites, now). Users can't install extensions at all, there, but could ask the site support to install certain extensions centrally.

[oschulz]

This is resolved, with webio_jupyter_extension installable as a Python package now. Now we just need to go out and convince JupyterHub operators to install the extension - I can confirm that it runs fine on at least one major JupyterHub installation. :-)