Added ability for selection representations to use original selection.
There are cases (e.g. Histogram View/Representation) where the selection-representation needs the original input selection (and not the selection converted to IDs). Added mechanism for that. vtkPVExtractSelection now has a 3rd output which is simply the same as its inputs. vtkSMChartRepresentationProxy can pass either the 2nd or 3rd output from vtkPVExtractSelection to the selection representation proxy based on how the property was named. Change-Id: I06ebeef9e9ff8168dacafe520e6c7d1202f2de59
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