Update BPHY15: duplicate suppression for D+

Add duplicate suppression for D+ in JpsiPlusDsCascade.cxx; change BMassLower, TrkTrippletMassLower, MassMin flags from 5600 to 5500 for Bc in BPHY15.py; change BMassUpper, TrkTrippletMassUpper, and MassMax flags from 6900 to 7200;