struct/class consistency.

Missing find_package for Boost.

This way the C++ code would know when to use either HepMC 2 or 3 during
the build...

Fix bug introduced in the flake8 cleanup (!38139).

Fixes ATLASSIM-4966, ATLASSIM-4967.

    
Remove reference to obsolete header StoreGate.h.

Remove `atlas_depends_on_subdirs` and cleanup library dependencies.

Remove `atlas_depends_on_subdirs` and cleanup link dependencies.

This code is used within the Higgs group for the truth-level
classification of events. It needed some minor updates for Rivet and
HepMC version migrations.

 - Prefer preincrement to postincrement for iterators.

Scott Snyder authored 4 years ago and Adam Edward Barton committed 4 years ago

Enable thread-safety checking and fix identified issues.

Ewelina Maria Lobodzinska authored 4 years ago and Edward Moyse committed 4 years ago

correct CMakeLists.txt for  GeneratorFilters, Herwig7, Sherpa and Tauplapp and add common fragments for Herwig7, Powheg and Tauolapp