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Fix AGENE-1818

Giancarlo Panizzo requested to merge gpanizzo/athena:21.6 into 21.6

External/Pythia8 and Generators/Pythia8_i were working with the Pythia 8.3 series with two exceptions, which this MR is fixing:

  1. soft qcd processes: Pythia8.3 needs, on top of the share/Pythia8/xmldoc subfolder, also share/Pythia8/pdfdata, which is now properly copied into the installArea by External/Pythia8/CMakeLists.txt
  2. UserHooks: Pythia8.3 changed the internal user hooks pointer from UserHooks* to shared_ptr<UserHooks*>. This must be managed with some care when trying to support both Pythia8.2 and Pythia8.3, which is now done by our interface Pythia8_i

Simple technical tests are passed. Now needs physics validation, out of the scope of this MR.

See https://its.cern.ch/jira/browse/AGENE-1818 G

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