tag, rather than the singleton.  Also merged in the "add text" so it makes
more sense.  Lastly, made sure that if there's only one thing to be added
that its metatype shows up in the add button.

Changed unusable search error to use straight absolute_url of database adapter to show as a link (redirects to manage_testForm).

On "searchable object has not been tested" error, provide the proper link to the connection in question in the "click here" message.

Corrected target of some message dialogs.

Caused manage_undo_transaction to redirect back to the manage_UndoForm page when a transaction was undone instead of going back to manage_main.