311049: fix focus issue in popup windows.
307743: export of bookmark keywords etc (patch by Chris Lawson).
293768: we now remember which container was selected in bookmarks.
Fixed HTML export by ensuring that the root folder has the appropriate special flag set.
Fixed "Redo" when moving a bookmark within a folder.
Fixed the first Undo after showing bookmarks (which used to throw an exception) by avoiding using the bookmarks undo manager for URL bar text operations.
Fixed drag and drop in the bookmarks to show the correct feedback when copying, and allow copying into the containers table again.
Fixed Undo in the url bar to not create undo items for no-op changes.
Fixed the context menu for empty rows in the bookmarks to enable the "New Folder" item.
Also cleaning up bookmarks reading and import code to deal better with corrupted bookmarks files, ensuring that we always end up with toolbar and menu containers. Fixed setting up the toolbar folder from a bookmarks.xml conversion. Allow us to read a Safari Bookmarks.plist file as the bookmarks file (rather than an import) in case a user copies it over. Break assumptions about the container ordering, so that if container folders get moved around in the bookmarks file, we'll still find them OK.
