TemplateSyntaxError is expected at compile time, not at run time.

Refs #19280.

Refs #18417. Also fixed some test case classes which subclassed
the wrong parent.

Hopefully it will fix the problem with the documentation building server
that caused a wrong Django version to be reported in the HTML zipball
docs edition.

Follow-up to commits 373df56d and 0b98ef63.

Minor spelling error in a docstring

These tests were silently skipped.

Thanks vzima for the report.

The old comment system was pre-1.0.

Thanks Simon Charette for the report.

This is giving more real test conditions when AUTH_USER_MODEL is
set with override_settings.

The previous pattern didn't properly addressed cases where '>'
was present inside quoted tag content.

Thanks Jeremy Dunck for the review.

This is required to allow the test to run without error under SQLite in the CI environment.

Thanks to kunitoki@gmail.com for the report.

Thanks to rizumu for the report.

SQLite used INSERT INTO tbl SELECT %s UNION SELECT %s, the problem
was that there should have been UNION ALL instead of UNION.

Refs #19351

F() expressions reuse joins like any lookup in a .filter() call -
reuse multijoins generated in the same .filter() call else generate
new joins. Also, lookups can now reuse joins generated by F().

This change is backwards incompatible, but it is required to prevent
dict randomization from generating different queries depending on
.filter() kwarg ordering. The new way is also more consistent in how
joins are reused.

Thanks Bruno Renié for noticing the error.

From version 2, a PostGIS template is no longer required to create
a GIS-enabled database.

Changed an if statement in the docs to a slightly cleaner variant.

Thanks george_edison for the report and Claude Paroz for the patch.

Django cannot delete more than 999 objects at a time with SQLite.

Refs #16426, #16039.

Thanks dstufft for the draft patch.

Thanks Jeremy Dunck for the report.

Also reverted 8fb7a900. Refs #17055.

Thanks Matt Lauber for the patch.