API CHANGE Removed LeftAndMain::add_menu_item(), LeftAndMain::remove_menu_item(), LeftAndMain::replace_menu_item(), LeftAndMain::clear_menu()
MINOR Disabled LeftAndMainTest, now covered by CMSMenuTest
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/cms/trunk@65095 467b73ca-7a2a-4603-9d3b-597d59a354a9