Merge branch '3.1-stable' into develop

Conflicts resolved:
	system/core/CodeIgniter.php
	system/database/drivers/sqlite/sqlite_driver.php
	system/database/drivers/sqlite/sqlite_forge.php
	system/database/drivers/sqlite/sqlite_result.php
	system/database/drivers/sqlite/sqlite_utility.php
	system/helpers/email_helper.php
	system/helpers/smiley_helper.php
	system/libraries/Cart.php
	system/libraries/Email.php
	system/libraries/Image_lib.php
	system/libraries/Javascript.php
	system/libraries/Javascript/Jquery.php
	system/libraries/Session/SessionHandlerInterface.php
	user_guide_src/source/changelog.rst
	user_guide_src/source/installation/downloads.rst
	user_guide_src/source/installation/upgrading.rst

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