[1.6.x] Fixed #22515 -- Fixed the object_id of the LogEntry that's created after a user password change in the admin.

Thanks ross at servercode.co.uk for the report.

Backport of 9e7f86b890 from master
[1.6.x] Fixed #22516 -- Added versionchanged annotation for STATIC_ROOT default value.

Backport of 658710be00 from stable/1.7.x
[1.6.x] Fixed #22493 - Added warnings to raw() and extra() docs about SQL injection

Thanks Erik Romijn for the suggestion.

Backport of 3776926cfe503f16c7195621da20c5b89bda70a2 from master
[1.6.x] Fixed #22504 -- Corrected domain terminology in security guide.

Thanks chris at chrullrich.net.

Backport of f65eb15ac6 from master
[1.6.x] Fixed #22507 -- Clarified nature of the sender argument of signals

Backport of d1f93e9c1e from master.