Removed usage of MultiIndex

App/inc/TestFresnelCoeff.h

App/inc/TestRootTree.h

App/src/FitSuiteHelper.cpp

App/src/IsGISAXSTools.cpp

App/src/TestDiffuseReflection.cpp

App/src/TestFittingModule1.cpp

App/src/TestFittingModule2.cpp

App/src/TestFormFactor.cpp

App/src/TestFresnelCoeff.cpp

App/src/TestMiscellaneous.cpp

App/src/TestMultiLayerRoughness.cpp

App/src/TestRootTree.cpp

Core/Algorithms/inc/DWBASimulation.h

Core/Algorithms/inc/GISASExperiment.h

Core/Algorithms/src/ChiSquaredFrequency.cpp

Core/Algorithms/src/ChiSquaredModule.cpp

Core/Algorithms/src/DWBASimulation.cpp

Core/Algorithms/src/DiffuseDWBASimulation.cpp

Core/Algorithms/src/Experiment.cpp

Core/Algorithms/src/GISASExperiment.cpp