Remove expired ports:

2020-06-30 databases/p5-Search-Xapian10: Depend on unsupported xapian-core. Use
databases/p5-Search-Xapian instead
2020-06-30 databases/xapian-core10: Unsupported by upstream. Use
databases/xapian-core instead
2020-06-30 devel/py-dj22-django-rq: Obsolete, please use www/py-django-rq
instead
2020-06-30 devel/rubygem-cucumber-expressions: Use
devel/rubygem-cucumber-cucumber-expressions instead
2020-06-30 devel/rubygem-cucumber-expressions6: Use
devel/rubygem-cucumber-cucumber-expressions instead
2020-06-30 devel/rubygem-cucumber-tag_expressions1: Use
devel/rubygem-cucumber-tag_expressions instead
2020-06-30 print/xpp: Last update as 2004-12-09, unsupported by upstream
2020-06-30 textproc/rubygem-gherkin: Use textproc/rubygem-cucumber-gherkin
instead
2020-06-30 www/p5-Catalyst-Model-Xapian10: Depend on unsupported xapian-core.
Use www/p5-Catalyst-Model-Xapian instead
2020-06-30 www/py-dj22-django-auth-ldap: Obsolete, please use
www/py-django-auth-ldap instead
2020-06-30 www/py-dj22-django-cacheops: Obsolete, please use
www/py-django-cacheops instead
2020-06-30 www/py-dj22-django-cors-headers: Obsolete, please use
www/py-django-cors-headers instead
2020-06-30 www/py-dj22-django-crispy-forms: Obsolete, please use
www/py-django-crispy-forms instead

Set a few repo-copied py-dj22- ports to expire

* These ports were already set as DEPRECATED some time ago and now have no
  consumers left as those have been switched back to the original ports.

Update Sphinx

- Repocopy textproc/py-sphinx to textproc/py-sphinx18

  Update it to 1.8.5 (latest version from 1.8.X).
  This version supports Python 2 and 3.
  Add test target.

- textproc/py-sphinx: Update to 3.0.2

  Python 3 only (3.5+).
  Add test target.

- Mk/Uses/python.mk: Add PY_SPHINX

Assign some ports I maintain from Django 1.11 to Django 2.2

Django 1.11 is End-of-Life since April 2020 thus switch the following ports
to Django 2.2 (which has LTS support until April 2022):

* www/py-django-auth-ldap
* www/py-django-cacheops
* www/py-django-filter
* www/py-django-prometheus

Adjust the required Python version as Django 2.2 needs at least Python 3.5+
and bump the PORTREVISION for package change.

Mark the related py-dj22-* port variants as DEPRECATED because they're
obsolete now.  Don't set an expiration date yet as they're still used by
some consumers and a few more Django 1.11 ports need to be assigned to
Django 2.2 first.

www/py-dj22-django-auth-ldap: Update to 2.1.1

Changelog:

* Removed deprecated "providing_args" from "Signal" instances.

https://github.com/django-auth-ldap/django-auth-ldap/blob/2.1.1/CHANGES

www/py-dj22-django-auth-ldap: Update to 2.1.0

Changelog:

* Reject authentication requests without a username
* Added support for Django 3.0 and Python 3.8
* Removed support for Django 2.1 which is End-of-Life

https://github.com/django-auth-ldap/django-auth-ldap/blob/2.1.0/CHANGES

www/py-{dj21,dj22}-django-auth-ldap: Update to 2.0.0

Changelog:

https://github.com/django-auth-ldap/django-auth-ldap/blob/2.0.0/CHANGES

New port: www/py-dj22-django-auth-ldap

Repo-copy www/py-django-auth-ldap and assign it to Django 2.2 to enable LDAP
authentication with net-mgmt/netbox that has been switched to Django 2.2 in
r502550 .

Also limit the port to Python 3.5+ as Django 2.2 requires it as minimum
dependency and update all related CONFLICTS_INSTALL entries.