* Use example_ynh as a template
* Implement change_url
* Use the new yunohost permissions system
* Use a python3 venv
* Use a systemd service + gunicorn
* Allow multiple instances (stop installing in /opt/yunohost/ihatemoney)
Instead of doing it by hand.
Also we now rely on the fact ynh automatically runs uninstall script if the
install fails. So no more need for manual cleanup.