Migrate Pythia8, HepMCanalysis, MCTester to HepMC3 in last LCG
In this MR: -update of cmake configuration for Pythia8, HepMCanalysis, MCTester to use latest hepmc3 from LCG
Tagging @akraszna
Edited by Andrii Verbytskyi
In this MR: -update of cmake configuration for Pythia8, HepMCanalysis, MCTester to use latest hepmc3 from LCG
Tagging @akraszna