Adding decfiles for separate signal components and possible backgrounds for a Bd_D0D0bar analysis.

These are the decfiles for the separate decay modes of the D0bar meson to get the correct MC efficiencies for an analysis of Bd_D0D0bar. Furthermore a sqDalitz version the 4h component of D0pipi is added as well as multiple background modes, namely Bu_DstD0 Bd_Dst0rho0 and different semi-charmless modes. It might be noticed that there is an issue with the extra/user tag for some of the added files. Since all extra (and most user) tags in these cases were already taken, I used the ones containing the most similar types of decay.