Provide information on plot input data range.
This commit provides an interface for querying the range of values taken on by a vtkPlot's X- and Y-axis inputs. This can be used to determine whether log-scaling is appropriate for each axis of the plot. It is part of a fix to ParaView bug 13899. Change-Id: Ia0449ca496dd935fb4ca25dc5dd2b691d2f89d93
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