Spring clean up in Unfolding/ and Uncertainties/

Patrick Louis S Connorrequested to merge
feature/unfolding_cleanup into main
  • saving covariance matrix of input MC in unfolding (useful for tests of smoothness)
  • automating getUnfPhysDist (axis levels guessed from axis title)
  • renaming of DAS::Unfolding::Variation into DAS::Unfolding::DistVariation to better distinguish from DAS::Uncertainties::Variation
  • better handling of smart pointers in DistVariation
  • extending common toolbox

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