PowhegControl (21.6): further fixes for ttj MiNNLO - AGENE-2055

Timothee Theveneaux-Pelzerrequested to merge
atlas-physics/pmg/mcexperts/powheg-experts/athena:21.6-Powheg_ttMiNNLO_Fixes into 21.6

Additional patches are added to the preliminary ttj MiNNLO implementation:

  • enabling several additional parameters, which look necessary for the process to actually work
  • allowing decays with MadSpin, since authors said that spin correlations may not work with the decay implemented in Powheg
  • a environment variable ttjMiNNLOPATH will be defined at the beginning of the run, pointing to the directory where the process is installed - this seems to be a possible bypass for the issues we're facing due to some file paths hardcoded in the fortran code (will need to have a patch of the fortran code itself, see details in the ticket)

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