Django-dirtyfields

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*New:*

- :code:`django-dirtyfields` is now tested with PostgreSQL, especially with specific fields

*Bugfix:*

- Fixes 80: Use of :code:`Field.rel` raises warnings from Django 1.9+
- Fixes 84: Use :code:`only()` in conjunction with 2 foreign keys triggers a recursion error
- Fixes 77: Shallow copy does not work with Django 1.9's JSONField
- Fixes 88: :code:`get_dirty_fields` on a newly-created model does not work if pk is specified
- Fixes 90: Unmark dirty fields only listed in :code:`update_fields`

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*New:*

- :code:`django-dirtyfields` is now compatible with Django 1.10 series (deferred field handling has been updated).

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*New:*

- A new attribute :code:`ENABLE_M2M_CHECK` has been added to :code:`DirtyFieldsMixin` to enable/disable m2m check
functionality. This parameter is set to :code:`False` by default.
IMPORTANT: backward incompatibility with v1.0.x series. If you were using :code:`check_m2m` parameter to
check m2m relations, you should now add :code:`ENABLE_M2M_CHECK = True` to these models inheriting from
:code:`DirtyFieldsMixin`. Check the documentation to see more details/examples.

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*Bugfix:*

- Fixing a bug preventing :code:`django-dirtyfields` to work properly on models with custom primary keys.

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After several years of existence, django-dirty-fields is mature enough to switch to 1.X version.
There is a backward-incompatibility on this version. Please read careful below.

*New:*

- IMPORTANT: :code:`get_dirty_fields` is now more consistent for models not yet saved in the database.
:code:`get_dirty_fields` is, in that situation, always returning ALL fields, where it was before returning
various results depending on how you initialised your model.
It may affect you specially if you are using :code:`get_dirty_fields` in a :code:`pre_save` receiver.
See more details at https://github.com/romgar/django-dirtyfields/issues/65.
- Adding compatibility for old _meta API, deprecated in Django `1.10` version and now replaced by an official API.
- General test cleaning.

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*New:*

- Adding Many-to-Many fields comparison method :code:`check_m2m` in :code:`DirtyFieldsMixin`.
- Adding :code:`verbose` parameter in :code:`get_dirty_fields` method to get old AND new field values.