Refs #4117 start of a line overlay for 1D lines in sliceviewer.

...d/MantidPlot/src/Mantid/SliceViewer/SliceViewerWindow.cpp

...tid/MantidPlot/src/Mantid/SliceViewer/SliceViewerWindow.h

Code/Mantid/MantidQt/SliceViewer/CMakeLists.txt

...idQt/SliceViewer/inc/MantidQtSliceViewer/ColorBarWidget.h

...antidQt/SliceViewer/inc/MantidQtSliceViewer/CustomTools.h

...liceViewer/inc/MantidQtSliceViewer/DimensionSliceWidget.h

...antidQt/SliceViewer/inc/MantidQtSliceViewer/LineOverlay.h

...dQt/SliceViewer/inc/MantidQtSliceViewer/QScienceSpinBox.h

...dQt/SliceViewer/inc/MantidQtSliceViewer/QwtRasterDataMD.h

...antidQt/SliceViewer/inc/MantidQtSliceViewer/SliceViewer.h

Code/Mantid/MantidQt/SliceViewer/src/ColorBarWidget.cpp

Code/Mantid/MantidQt/SliceViewer/src/CustomTools.cpp

.../Mantid/MantidQt/SliceViewer/src/DimensionSliceWidget.cpp

Code/Mantid/MantidQt/SliceViewer/src/LineOverlay.cpp

Code/Mantid/MantidQt/SliceViewer/src/QScienceSpinBox.cpp

Code/Mantid/MantidQt/SliceViewer/src/QwtRasterDataMD.cpp

Code/Mantid/MantidQt/SliceViewer/src/SliceViewer.cpp

.../Mantid/MantidQt/SliceViewer/src/main_SliceViewerDemo.cpp