-Add library selection by secret key as an alternative to selection by
-user/pw. This is appropriate for security-conscious customers to embed
-in their own CORS-aware Apache2 configuration.
+ The widget-builder widget (WBW) should have a Save button that
+ is customised by a callback, so that the widget in question
+ can (for example) be copied into the clipboard, pasted into a
+ nominated div, saved to a database or whatever.