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Geant4: document RunManager perforamnce issue and allow multithreading with one worker

Stephan Lachnit requested to merge slachnit/allpix-squared:p-mt-adjustments-for-g4 into master

Follow-up of !943 (closed).

  • Fixes a missing override in run managers
  • Allows multithreading with one worker (emit warning)
  • Add test for MT with one worker
  • Updates documentation to inform users about this issue

Two questions remain:

  • Should the multithreading=true+worker=1 log message be a warning if it is a legitimate use-case?
  • Should the test for this case be part of GeometryBuilderGeant4? It's actually just a copy of a DepositionGeant4 test with adjusted mt settings

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