Draft: Semileptonic requests

Adding three requests for a new analysis of the 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}

The analysis aims to gain a better understanding of the hadronic resonances in the D\pi spectrum