Hepmc3 nightly fixes 22122020 part 1
In this MR:
- Replace
GenParticle*withGenParticlePtrand similar - Use free functions like
HepMC::barcode - Use std:: explicitly
- Use C++11 loops for HepMC3 compatibility
Edited by Andrii Verbytskyi
In this MR:
GenParticle* with GenParticlePtr and similarHepMC::barcode