+/* PsppireDataWindow is a top-level window for editing a PSPP dataset.
+
+ PsppireDataWindow contains a PsppireDataEditor.
+
+ PsppireDataWindow's own functionality basically amounts to managing menus
+ and toolbars. In addition to maintaining some menu itema and toolbar items
+ of its own, it merges in menu and toolbar items provided by its child
+ PsppireDataEditor (based on the "ui-manager" property of PsppireDataEditor).
+ */