Merge branch 'master' into 18215_add_test_for_CalculateSlits

Framework/Kernel/inc/MantidKernel/TimeSeriesProperty.h

Framework/Kernel/src/TimeSeriesProperty.cpp

Framework/Kernel/test/TimeSeriesPropertyTest.h

MantidPlot/src/ApplicationWindow.cpp

MantidPlot/src/Graph.cpp

MantidPlot/src/Graph.h

MantidPlot/src/Mantid/MantidUI.cpp

MantidQt/API/inc/MantidQtAPI/VatesViewerInterface.h

MantidQt/API/src/VatesViewerInterface.cpp

...nc/MantidQtCustomInterfaces/Muon/MuonAnalysisDataLoader.h

...idQt/CustomInterfaces/src/Muon/MuonAnalysisDataLoader.cpp

...gets/inc/MantidVatesSimpleGuiViewWidgets/MdViewerWidget.h

Vates/VatesSimpleGui/ViewWidgets/src/MdViewerWidget.cpp

Vates/VatesSimpleGui/ViewWidgets/src/MultisliceView.cpp

Vates/VatesSimpleGui/ViewWidgets/src/SplatterPlotView.cpp

Vates/VatesSimpleGui/ViewWidgets/src/StandardView.cpp

Vates/VatesSimpleGui/ViewWidgets/src/ThreesliceView.cpp

docs/source/release/v3.9.0/muon.rst

docs/source/release/v3.9.0/ui.rst