Refactor tuning parameters and fit parameters

m.puchnerrequested to merge
tuningAndFit into develop

To simplify refactoring of SampleModel, the handling of tuning parameters and fit parameters was refactored.

  • free tuning parameter tree from SessionModel
  • reduce SessionItem exposure at class interfaces
  • reduce SessionModel usage
  • reduce SessionPath (SessionModel hierarchy) usage
  • show units in the tuning tree
  • simplify code, remove obsolete code
  • minor corrections/refactorings

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