Add event content printing to HepMC2 branch with HepMC::Print::content
Add event content printing to HepMC2 branch with HepMC::Print::content.
Will solve https://its.cern.ch/jira/browse/AGENE-2277
Add event content printing to HepMC2 branch with HepMC::Print::content.
Will solve https://its.cern.ch/jira/browse/AGENE-2277