Revert "1. (important) bug fix, for targetbimix; ans1,2 instead of p1, 2"

This reverts commit 36687ec577bf50c9776cb7b4c8d49dcd42aaba1d.
Revert "Revert "1. (important) bug fix, for targetbimix; ans1,2 instead of p1, 2""

This reverts commit 13329b0720762f6a448e473b823306c4e9fab167.
Revert "(important) bugfix, correct mu constraints"

This reverts commit a54aca85785a4353468d507174fd85ed3d4324bd.

and actually the mu constraints in MLE method is right