Scholar.TreeView is now Scholar.FolderTreeView (SourcesTreeView later? depends)
Some changes to the way FolderTreeView works.
New Scholar.ItemGroup -- used by FolderTreeView and ItemTreeView.
the root folder is not currently displayed -- doesn't really matter because we are changing the way it all works.
(note: the Scholar.Items.getAll() function does not seem to be working correctly -- try clicking on the library)
