Configures the garbage collector plugin

def configure(self):
        """Configures the garbage collector plugin"""
        dlg = GCPluginConfigDialog(self.__where)
        if dlg.exec_() == QDialog.Accepted:
            newWhere = dlg.getCheckedOption()
            if newWhere != self.__where:
                self.__where = newWhere
                self.__saveConfiguredWhere()