Update ParticleIdUtils content to match latest MCUtils, including PID-decoding speedup
Update ParticleIdUtils content to match latest MCUtils. Includes a serious speed-up (6x!) in PID digit decoding!
For 3.x, should we just shift to relying on the external HEPUtils and MCUtils libs, to avoid duplication, and put their (trivial) installation into the bootstrap script? I would like to be able to avoid these manual merges of duplicated code!