Delete Herwigpp packages
The Generators/Herwigpp_i package was disabled two years ago (5859ce6a). Remove the
code from the repository now. In addition, delete the External/Herwigpp package, which I think should also be obsolete.
The Generators/Herwigpp_i package was disabled two years ago (5859ce6a). Remove the
code from the repository now. In addition, delete the External/Herwigpp package, which I think should also be obsolete.