RELEASE_1_4_20 => v1.4.20 commit

Conflicts:
	CHANGELOG
	lib/autoload/sfAutoloadAgain.class.php
	lib/autoload/sfCoreAutoload.class.php
	lib/widget/sfWidget.class.php
	lib/widget/sfWidgetForm.class.php
	test/unit/form/sfFormTest.php
	test/unit/widget/sfWidgetFormTest.php
	test/unit/widget/sfWidgetTest.php