Put back pure python serialization functions.
Put back pure python serialization functions.

The are still needed by mapreduce.pipes.

crs4/pydoop,simleo/pydoop,simleo/pydoop,simleo/pydoop,elzaggo/pydoop,crs4/pydoop,crs4/pydoop,elzaggo/pydoop,crs4/pydoop,crs4/pydoop,elzaggo/pydoop,simleo/pydoop,elzaggo/pydoop,elzaggo/pydoop,simleo/pydoop