void QgsMapLayerAction::triggerForFeature( QgsMapLayer* layer, QgsFeature* feature )
{
  emit triggeredForFeature( layer, feature );
  //also trigger this action for the specified layer
  triggerForLayer( layer );
}
void QgsMapLayerAction::triggerForFeature( QgsMapLayer* layer, const QgsFeature* feature )
{
  emit triggeredForFeature( layer, *feature );
}