Do not update/delete: Banner broadcast message test data
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Do not update/delete: Notification broadcast message test data
Use the new Signon DBus API
It's documented here and will allow full compatibility with the Qt Signon client.
Plus this will solve issue #3.
I wonder if we don't just want a gSignond v2 that would implement it, and fix all the introspection issues I found that lead to some incompatible API changes anyway.