Implemented OwnFieldNames for sym eval.
Implemented OwnFieldNames for sym eval.

brownplt/LambdaS5,logchi/LambdaS5,brownplt/LambdaS5,lijunsong/LambdaS5,brownplt/LambdaS5,lijunsong/LambdaS5,logchi/LambdaS5,logchi/LambdaS5,lijunsong/LambdaS5