fixed majority of slots connected to propertyChanged()

GUI/coregui/Models/BeamDistributionItem.cpp

GUI/coregui/Models/JobItem.cpp

GUI/coregui/Models/JobItem.h

GUI/coregui/Models/ModelMapper.cpp

GUI/coregui/Models/ParameterizedItem.cpp

GUI/coregui/Models/ParameterizedItem.h

GUI/coregui/Models/ParticleCoreShellItem.cpp

GUI/coregui/Models/ParticleCoreShellItem.h

GUI/coregui/Models/ParticleDistributionItem.cpp

GUI/coregui/Models/ParticleDistributionItem.h

GUI/coregui/Models/ParticleLayoutItem.cpp

GUI/coregui/Models/ParticleLayoutItem.h

GUI/coregui/Models/SampleModel.cpp

GUI/coregui/Models/SessionModel.cpp

GUI/coregui/Models/SessionModel.h

GUI/coregui/Views/InfoWidgets/DistributionWidget.cpp

GUI/coregui/Views/InfoWidgets/DistributionWidget.h

GUI/coregui/Views/IntensityDataWidgets/ColorMapPlot.cpp

...oregui/Views/IntensityDataWidgets/HorizontalSlicePlot.cpp

GUI/coregui/Views/IntensityDataWidgets/HorizontalSlicePlot.h