add bkgs for phimutau search with misid pi to mu. both reco control mode and actual bkg

I've added six files relevant to misid background studies in the RD Bs -> phimutau search with tau->3pi. One set uses a fully reconstructed D meson, which is reconstructed in data as a control mode. The corresponding D -> 3piX cocktail files represent the actual background. The cocktail description is taken from the DDKst0 decfiles previously committed, including the tight gen cut for D->3piX.

Event types may need review: the fully reconstructed mode event types are very common, and a lot of the already committed files seem to me to have some cases where the same extra flag is used for multiple final states.

For the cocktails, I went back to DDKst but even there it seemed to be not consistent in which decay flag should be used. I picked "3" here since while there are many decays included they all have D->3pi in the final state. Please advise.