We've had quite a few requests to bring back the %store magic of earlier versions.
This simply restores variables when the extension is loaded, so if it's specified in a config file, it will behave the same way as before.
Restore pspersistence, including %store magic, as an extension.
Looks great, I'll add a note in the docstring about how to enable it and will merge now. Thanks!
Note that I renamed the extension file to storemagic.py, which is more indicative of the provided functionality.