When a jabber client supports a feature, it is recommended to advertise that
if asked by another client. The smack lib provide a ServiceDiscoveryManager to
perform this task.
I have added some supported features, but I don't know them all.
For example the features supported by our muc impl. So if you have added some
features to jabber, you may look at the comment on
private List supportedFeatures = new ArrayList();
to make sure that the implemented feature is advertised.
Currently, features are registered just after the registration of the opSet
which adds this feature, in
protected void initialize(String screenname,