Django-addanother

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Update to Django 4.

Remove empty label duplicates with select2.

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Fix shared widget state (e.g., error messages) between multiple forms/widget instances.

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Add Django 3.0 support

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New feature: Edit-related buttons next to add-another buttons, to allow for quick
modification of related objects in a popup.

**Backwards incompatible:** ``PopupMixin``
has been renamed to ``CreatePopupMixin`` without a deprecation path. (Olivier Dalang)

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Rewrite/merge with yourlabs implementation. Not backwards compatible!

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Initial release