Shallow copying of `django.utils.functional.LazyObject` or its subclasses has
been broken in a couple of different ways in the past, most recently due to
35355a4f.

Prior to 55f12f87, the template origin was available on each node via
`self.token.source[0]`. This behavior was removed when debug handling was
simplified, but 3rd-party debugging tools still depend on its presence.
This updates the Parser to set origin on individual nodes. This enables the
source template to be determined even when template extending or including is
used.

This was causing an issue when calling the `migrate` command in a test case with
the `available_apps` attribute pointing to an application with migrations
disabled using the `MIGRATION_MODULES` setting.

Thanks to Tim Graham for the review.

Refs #24919

Debian packages unconditionally byte-compile .py files on installation and
do not silence errors by design. Therefore, we need a way of shipping these
invalid .py files without a .py extension but ensuring that when we
template them, they end up as .py.

We don't special-case .py files so that the all the TemplateCommand
command-line options (eg. extra_files and extensions) still work entirely
as expected and it may even be useful for other formats too.

Thanks Shai Berger for the report.

Thanks to Markus Holtermann and Tim Graham for their review.

Thanks to Markus Holtermann and Tim Graham for their review.

Previously, the lastmod of the last sitemap was always used.
All sitemaps are required to have a lastmod.

Thanks Sylvain Fankhauser for the report and Tim Graham for the review.

Thanks Simon Charette and Claude Paroz for the reviews.

AUTOINCREMENT is dropped converting an AutoField to IntegerField
which isn't the point of this test. MySQL would warn or error about
this.

default_storage_engine was introduced in MySQL 5.5.3.
storage_engine was removed in MySQL 5.7.5.

`action="."` strips query parameters from the URL which is not usually what
you want. Copy-paste coding of these examples could lead to difficult to
track down bugs or even data loss if the query parameter was meant to alter
the scope of a form's POST request.