This is an efficient implementation of Materialized Path trees for Django, as described
by Vadim Tropashko in SQL Design Patterns. Materialized Path is probably the fastest
way of working with trees in SQL without the need of extra work in the database, like
Oracle’s CONNECT BY or sprocs and triggers for nested intervals.
For reasons unknown to the community, Gustavo Picón the maintainer of
django-treebeard stopped working on this project. The latest version available from
PyPI is 4.0.1, which is not compatible with Django-1.10