Adding a Resize option in ChartMatrix and Use it in ScatterPlot
vtkChartMatrix now features a SetSpecificResize allowing to move the bottom left point of a single chart. This feature is used in vtkScatterPlotMatrix to move the Big Chart plot a little on top right in order to prevent overlap, using painter to compute axis bounding rect. It also add a compare operator to vector in order to use it in the stl.
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