Additional MC for Bu2munugamma
Adding the pending MC production of MR!680 (simulation is now ready).
- resonant Bu -> mu nu Xu (-> X gamma)
- resonant Bd -> mu nu rho+ (-> X gamma)
- PHSP Bu -> mu nu gamma
Although, some parts of the selection are not applied to the three MC productions of this MR, the scripts are kept identical to MR!680 for completeness.