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Merged in the HepMC3 branch. Compiling and running with HepMC2 is fully…

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Merged in the HepMC3 branch. Compiling and running with HepMC2 is fully validated against release 2.7.2. Compiling and running with HepMC3 also works but give slightly different results for some analyses since the ordering of particles in GenEvent is changed.