LSNBLDR-281; add item accessibility, handle top-level page special check


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/trunk@128925 66ffb92e-73f9-0310-93c1-f5514f145a0a
LSNBLDR-281; improve explanation


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/trunk@128926 66ffb92e-73f9-0310-93c1-f5514f145a0a