Notifies listeners of the given data model object of changes
in the underlying data. Listeners usually will connect
themselves to the "changed" signal in the GdaDataModel
class, thus being notified of any new data being appended
or removed from the data model.
Notifies listeners of the given data model object of changes in the underlying data. Listeners usually will connect themselves to the "changed" signal in the GdaDataModel class, thus being notified of any new data being appended or removed from the data model.