Refs #3882: Demo of a slice viewer working off of a faked MDHistoWorkspace

...ork/Geometry/inc/MantidGeometry/MDGeometry/IMDDimension.h

Code/Mantid/MantidPlot/CMakeLists.txt

...antidPlot/src/Mantid/SliceViewer/DimensionSliceWidget.cpp

.../MantidPlot/src/Mantid/SliceViewer/DimensionSliceWidget.h

...MantidPlot/src/Mantid/SliceViewer/DimensionSliceWidget.ui

...tid/MantidPlot/src/Mantid/SliceViewer/QwtRasterDataMD.cpp

...antid/MantidPlot/src/Mantid/SliceViewer/QwtRasterDataMD.h

...MantidPlot/src/Mantid/SliceViewer/QwtRasterDataTester.cpp

...d/MantidPlot/src/Mantid/SliceViewer/QwtRasterDataTester.h

.../Mantid/MantidPlot/src/Mantid/SliceViewer/SliceViewer.cpp

Code/Mantid/MantidPlot/src/Mantid/SliceViewer/SliceViewer.h

Code/Mantid/MantidPlot/src/Mantid/SliceViewer/SliceViewer.ui

Code/Mantid/MantidPlot/src/Mantid/SliceViewer/main.cpp