Fixed #23785 -- Typo in docs/releases/1.6.txt
Fixed a typo in 1.6 release notes.
Fixed #23789 -- TemplateResponse handles context differently from render
Simplified MySQL storage engine detection using INFORMATION_SCHEMA.ENGINES table

Query the table introduced in MySQL 5.1; refs #23144.
Removed legacy code from old transaction system
Merge pull request #3489 from tchaumeny/testcases_cleanup

Removed legacy code from old transaction system
Fixed negligible formatting error.
Fixed #22407 -- Added BaseEmailHandler to allow customizing mail senders.