Add BC_VPPHAD model
Adding new decay model created by @aluchins for the Bc+ -> Jpsi p pbar pi+ process. The work under the model is ongoing, soon we expect some code modifications with description of one more Bc+ decay with the protons in the final state. This MR is for the Sim09, but will certainly need also to be ported to Sim10. Probability distributions are attached. probs.pdf