add_xicc_decayfiles
add new decfiles for xicc study:
- 26265052 Xicc+_LcKpi,pKpi-res=Xicc_LcKpi,pKpi-res=GenXicc,DecProdCut,t=80fs,WithMinPT3,MinDaughterPT200.dec
- 26264054 Xicc++_Xicpi,pKpi-res=GenXicc,DecProdCut,t=256fs,WithMinPT3,MinDaughterPT200.dec
- 26265052 Xicc+_LcKpi,pKpi-res=Xicc_LcKpi,pKpi-res=GenXicc,DecProdCut,t=80fs,WithMinPT3,MinDaughterPT200.dec