Removing commented AND outdated pieces of code related to HepMC that contain no explanations

Andrii Verbytskyirequested to merge
averbyts/athena:HepMC3_Athena_Remove_point3d into master

Removing some commented AND outdated pieces of code related to HepMC that contain no explanations.

  • Some comments WITH explanations are left.

  • Many removed coments are not compatible with HepMC3 in the present state.

Merge request reports