Django-modelcluster

~~~~~~~~~~~~~~~~
* Implement `copy_cluster` method on ClusterableModel (Karl Hobley)
* Add `formset_name` option on ClusterableModel formsets to allow the formset name to differ from the relation name (Matt Westcott)
* Fix: Fix tests for Django 3.2 (Alex Tomkins, Matt Westcott, María Fernanda Magallanes)
* Fix: Ensure ptr_id fields are correctly populated when deserialising models with multi-level inheritance (Alex Tomkins)

~~~~~~~~~~~~~~~~
* Allow child form class to be overridden in the `formsets` Meta property of ClusterForm (Helder Correia)
* Add prefetch_related support to ParentalManyToManyField (Andy Chosak)
* Implement `copy_child_relation` and `copy_all_child_relations` methods on ClusterableModel (Karl Hobley)
* Fix: Fix behavior of ParentalKeys and prefetch_related() supplied with a lookup queryset (Juha Yrjölä)

~~~~~~~~~~~~~~~~~~
* Fix: Fix compatibility with django-taggit 1.3.0 (Martin Sandström)

~~~~~~~~~~~~~~~~~~
* Fix: ClusterForm without an explicit `formsets` kwarg now allows formsets to be omitted from form submissions, to fix regression with nested relations
* Fix: ParentalManyToManyField data is now loaded correctly by `manage.py loaddata` (Andy Babic)

~~~~~~~~~~~~~~~~
* Removed Python 2 and 3.4 support
* Removed Django 1.10 and 1.11 support
* Added django-taggit 1.x compatibility (Gassan Gousseinov, Matt Westcott)

~~~~~~~~~~~~~~~~~~
* Fix: ClusterForm without an explicit `formsets` kwarg now allows formsets to be omitted from form submissions, to fix regression with nested relations