ENHANCEMENT Making $permissionCode argument optional for BasicAuth::requireLogin(). If not set the logic only checks for a valid account (but no group memberships)
ENHANCEMENT Using SS_HTTPResponse_Exception instead of header()/die() in BasicAuth::requireLogin() to make it more testable
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/branches/2.4@107867 467b73ca-7a2a-4603-9d3b-597d59a354a9