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
Edited by Dmitrii Pereima