Add D -> K3pi decfiles with tight cuts.
Add 6 decfiles for inclusive Dst and semileptonic B decays to D0 -> K3pi:
- dkfiles/Bu_D0munu,Kpipipi=TightCuts,AmpGen.dec
- dkfiles/Bu_D0munu,Kpipipi=TightCuts,PhSp.dec
- dkfiles/Bu_D0munu,piKpipi=TightCuts,AmpGen.dec
- dkfiles/Dst_D0pi,Kpipipi=TightCuts,AmpGen.dec
- dkfiles/Dst_D0pi,Kpipipi=TightCuts,PhSp.dec
- dkfiles/Dst_D0pi,piKpipi=TightCuts,AmpGen.dec