Close buttons on the Metadata and Notes.
The Collections list no longer throws an exception when the header is clicked.
More minor interface improvements.
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)
