Rename enum constants of prod_opt_ module.

src/algorithm/factorization/faust_palm4msa2020_2.hpp

src/faust_linear_operator/CPU/faust_TransformHelper.h

src/faust_linear_operator/CPU/faust_TransformHelper.hpp

src/faust_linear_operator/CPU/faust_TransformHelperPoly.h

src/faust_linear_operator/CPU/faust_TransformHelperPoly.hpp

src/faust_linear_operator/CPU/faust_prod_opt.h

src/faust_linear_operator/CPU/faust_prod_opt.hpp

src/faust_linear_operator/GPU2/faust_TransformHelper_gpu.h

src/faust_linear_operator/GPU2/faust_TransformHelper_gpu.hpp

src/faust_linear_operator/faust_TransformHelperGen.h

src/faust_linear_operator/faust_TransformHelperGen.hpp

wrapper/matlab/+matfaust/@FaustMulMode/FaustMulMode.m

wrapper/python/pyfaust.py