Fixed #23499 -- Error in built-in template tag "now" documentation
Fixed #23491 -- Clarified tutorial 3.

Thanks diek for the suggestion.
Fixed #21775 -- Allowed customization of datafile for Oracle tablespace
Updated release notes for backporting locale additions; refs #23368 and #23417.
Fixed #23495 -- Stopped swallowing real settings import error

Thanks papaloizouc for the report.
Skipped some broken tests on Oracle GIS; refs #23504.
Avoided a crash on an Oracle GIS test; refs #23504.
Added a feature flag for add_srs_entry support; refs #22632 and #23504.
Added feature flag for geometry_field_introspection; refs #22632 and #23504.
Improved GIS migration test cleanup; refs #23504.
Fixed #23488 -- Added AnonymousUser.get_username().
Removed unnecessary order_by() from a GIS test that crashed Oracle.

Oracle cannot order_by() a TextField; refs #23504.
Fixed string length check in LayerMapping
Fixed #23514 -- Prevented queries in PostGISOperations init

Thanks Mattia Procopio for the report.
Fixed #23443 -- Corrected erroneous FieldError message.

Thanks Tim Graham for the review.
Fixed a formatting issue in the 1.7 release notes.
Fixed Oracle GIS failures introduced by e9103402c0; refs #18757.

Thanks Marc Tamlyn for the patch.
Fixed some flake8 errors.

Originally I added migrations to flake8 exclude because of long lines
in migration files, but there are other directories named migrations we
do want to check. We are not warning on line lengths yet anyway.
Made a GIS test work on Oracle.

Thanks Josh Smeaton and Claude Paroz for advice.
Skipped a broken GIS test on Oracle; refs #23504.