Add three new decfiles

! 2017-12-13 - Victor Renaudin

• Added 3 new decay files for background sources of the hadronic R(Lc) analysis with generator level cut. 15895401: Lb_LcD0,D02hhhNneutrals=DecProdCut,TightCuts.dec 15893401: Lb_LcD-,D-2hhhNneutrals=DecProdCut,TightCuts.dec 15296601: Lb_LcDs,Ds2hhhNneutrals=DecProdCut,TightCuts.dec