Added LeftAndMain::alternateAccessCheck() / alternateMenuDisplayCheck() so that subsite could hook a new security model into the admin
Added support for Group::alternateTreeTitle() to allow subsites to put *s before global groups
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@41098 467b73ca-7a2a-4603-9d3b-597d59a354a9