Openwisp-utils

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- [change] Simplified implementation and usage of ``OPENWISP_ADMIN_SITE_CLASS``

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- [feature] Added configurable ``AdminSite`` class and ``OPENWISP_ADMIN_SITE_CLASS``
- [theme] Adapted theme to django 2.2
- [qa] openwisp-utils-qa-checks now runs all checks before failing
- [qa] Added support for multiple migration name check in openwisp-utils-qa-checks
- [qa] Added pending migrations check (``runcheckpendingmigrations``) to openwisp-utils-qa-checks

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- Added ``ReadOnlyAdmin``
- Added ``AlwaysHasChangedMixin``
- Added ``UUIDModel``
- Moved multitenancy features to
`openwisp-users <https://github.com/openwisp/openwisp-users>`_
- [qa] Added ``checkendline``, ``checkmigrations``, ``checkcommit``,
later integrated in ``openwisp-utils-qa-checks`` (corrected)
- Added navigation menu
- Added configurable settings for admin headings

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- `20 <https://github.com/openwisp/openwisp-utils/issues/20>`_:
[qa] Added ``checkcommit`` QA check (thanks to `ppabcd <https://github.com/ppabcd>`_)

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- `dc977d2 <https://github.com/openwisp/openwisp-utils/commit/dc977d2>`_:
[multitenancy] Avoid failure if org field not present
- `13 <https://github.com/openwisp/openwisp-utils/pull/13>`_:
[DRF] Added ``BaseSerializer``
- `16 <https://github.com/openwisp/openwisp-utils/pull/16>`_:
[qa] Added migration filename check
- `babbd74 <https://github.com/openwisp/openwisp-utils/commit/babbd74>`_:
[multitenancy] Added ``MultitenantAdminMixin.multitenant_parent``
- `6d45df5 <https://github.com/openwisp/openwisp-utils/commit/6d45df5>`_:
[qa] Pin down ``flake8`` and ``isort`` in ``extra_requires['qa']``

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- `10 <https://github.com/openwisp/openwisp-utils/pull/10>`_:
[qa] add django 2.0 compatibility
- `d742d4 <https://github.com/openwisp/openwisp-utils/commit/d742d4>`_:
[version] Improved get_version to follow PEP440