gnu: Add python-django-netfields.

* gnu/packages/django.scm (python-django-netfields): New public variable.

gnu: Add python-django-logging-json.

* gnu/packages/django.scm (python-django-logging-json): New public variable.

gnu: Add python-django-auth-ldap.

* gnu/packages/django.scm (python-django-auth-ldap): New public variable.

gnu: python-ldap: Update to 3.3.1.

* gnu/packages/openldap.scm (python-ldap): Update to 3.3.1.

gnu: Deprecate python-django-jsonfield.

* gnu/packages/django.scm (python-django-jsonfield): Rewrite in terms of
DEPRECATED-PACKAGE with PYTHON-DJANGO as the replacement.

gnu: Remove python2 versions of Django packages.

Python 2 is EOL and not supported by current versions of Django.

* gnu/packages/django.scm (python-django, python-django-tagging)[properties]:
Remove PYTHON2-VARIANT.
* gnu/packages/django.scm (python2-django, python2-django-simple-math-captcha,
python2-pytest-django, python2-django-filter, python2-django-allauth,
python2-django-gravatar2, python2-django-assets, python2-django-jsonfield,
python2-dj-database-url, python2-django-bulk-update,
python2-django-contact-form, python2-django-contrib-comments,
python2-django-overextends, python2-django-redis, python2-django-rq,
python2-django-sortedm2m, python2-django-appconf, python2-django-statici18n,
python2-django-tagging): Remove variables.

gnu: python-django-override-storage: Update to 0.3.0.

* gnu/packages/django.scm (python-django-override-storage): Update to 0.3.0.
[source]: Switch to GIT-FETCH.
[arguments]: New field.
[native-inputs]: Add PYTHON-MOCK.

gnu: python-django-sekizai: Update to 2.0.0.

* gnu/packages/django.scm (python-django-sekizai): Update to 2.0.0.

gnu: python-django-statici18n: Update to 1.9.0.

* gnu/packages/django.scm (python-django-statici18n): Update to 1.9.0.
[source]: Switch to GIT-FETCH.
[arguments]: New field.
[native-inputs]: Add PYTHON-PYTEST and PYTHON-PYTEST-DJANGO.

gnu: python-django-appconf: Update to 1.0.4.

* gnu/packages/django.scm (python-django-appconf): Update to 1.0.4.
[arguments]: New field.
[propagated-inputs]: Remove PYTHON-SIX.

gnu: python-django-sortedm2m: Update to 3.0.2.

* gnu/packages/django.scm (python-django-sortedm2m): Update to 3.0.2.
[arguments]: Remove #:tests?.  Add #:phases.
[home-page]: Update to current.

gnu: python-django-q: Update to 1.3.3.

* gnu/packages/django.scm (python-django-q): Update to 1.3.3.
[arguments]: Add #:tests?.  Remove #:phases.
[native-inputs]: Remove.

gnu: python-django-rq: Update to 2.3.2.

* gnu/packages/django.scm (python-django-rq): Update to 2.3.2.
[native-inputs]: Add PYTHON-DJANGO-REDIS, PYTHON-MOCK, and PYTHON-RQ-SCHEDULER.

gnu: Add python-rq-scheduler.

* gnu/packages/databases.scm (python-rq-scheduler): New public variable.

gnu: Add python-croniter.

* gnu/packages/python-xyz.scm (python-croniter): New public variable.

gnu: python-rq: Update to 1.5.1.

* gnu/packages/databases.scm (python-rq): Update to 1.5.1.
[source]: Change to GIT-FETCH.
[arguments]: New field.
[native-inputs]: Add PYTHON-MOCK, PYTHON-PYTEST, and REDIS.

gnu: python-redis: Update to 3.5.3.

* gnu/packages/databases.scm (python-redis): Update to 3.5.3.

gnu: python-django-redis: Update to 4.12.1.

* gnu/packages/django.scm (python-django-redis): Update to 4.12.1.

gnu: python-django-contrib-comments: Update to 1.9.2.

* gnu/packages/django.scm (python-django-contrib-comments): Update to 1.9.2.

gnu: python-django-contact-form: Update to 1.8.1.

* gnu/packages/django.scm (python-django-contact-form): Update to 1.8.1.
[arguments]: Adjust test invokation, drop flake8 checks.
[native-inputs]: Remove PYTHON-FLAKE8.