Django-polymorphic-tree

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* Fix tree list appearance for Django 1.9 and flat theme.

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* Fix breadcrumbs in Django 1.7+, displaying the ``AppConfig`` name.
* Fix breadcrumbs in ``object_history.html`` template.
**NOTE:** This may require to redefine an ``admin/polymorphic_tree/object_history.html`` template
when your project uses django-reversion_ or django-reversion-compare_.

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* Fix compatibility with Django 1.9.
* Fix support for MPTT ``get_previous_sibling()`` / ``get_next_sibling()``.
* Fix compatibility with django-polymorphic_ 0.8 final

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* Fix compatibility with upcoming django-polymorphic_ 0.8

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* Fixed URL resolving for for multi admin sites.
* Fixed URL breadcrumbs for delete page, visible when using non-standard delete URLs (e.g. django-parler_'s delete translation page).
* Fixed showing ``DateTimeField`` in local time.
* Enforcing at least django-polymorphic_ 0.7.1 for Django 1.8 compatibility.

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* Added Django 1.8 compatibility
* Added django-mptt 0.7 support
* Fixed Python 3 issue in the admin code
* Fixed attempting to import south in Django 1.7/1.8 environments
* Fixed default MPTT model ordering, using tree_id, lft now
* Test ``polymorphic.__version__`` to determine the api of ``get_child_type_choice()``.