API CHANGE Removed autoSave() javascript logic in CMS, superseded by custom code in LeftAndMain.EditForm.js
ENHANCEMENT Using jquery.changetracker in LeftAndMain.EditForm.js, and overhauled window.unload logic to automatically trigger ajax saving after a user confirmation
MINOR Changed unload confirmation text in CMS logic to adapt to new behaviour
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/cms/trunk@92685 467b73ca-7a2a-4603-9d3b-597d59a354a9