public static void instanceListToArffFile(File outputFile,FeatureStore instanceList) throws Exception {
  instanceListToArffFile(outputFile,instanceList,false,false);
}

public static void instanceListToArffFile ( File outputFile , FeatureStore instanceList ) throws Exception { instanceListToArffFile ( outputFile , instanceList , false , false ) ; }
converts a feature store to a list of instances . single - label case .
