DecFiles for Semileptonic B decays

Adding three new DecFiles for an analysis on semileptonic B decays:

Bd_D0pimunu,Kpi=DecProdCut,cocktail.dec
Bu_D+pimunu,Kpipi=DecProdCut,cocktail.dec
Bs_Dspimunu,piKK=DecProdCut,cocktail.dec

They are corresponding to the following decays:

• B^0 \rightarrow D^0 (\rightarrow K^- \pi^+) \pi^+ \ell^- \bar{\nu}
• B^- \rightarrow D^+ (\rightarrow K^+ \pi^+ \pi^-) \pi^- \ell^- \bar{\nu}
• \bar{B}_s^0 \rightarrow D_s^+ (\rightarrow \pi^+ K^+ K^-) \pi^0 \ell^- \bar{\nu}

We allow for mixing in the neutral B mesons.