[vtkusers] Multiple input data in custom vtkPolydataFilter

[David Gobbi]

For the second port, you might want to set INPUT_IS_REPEATABLE()
in addition to INPUT_IS_OPTIONAL().

This will allow you to use AddInputData(1, data) to input as many
secondary objects to the port as you desire.  The number of input
ports for a VTK filter is fixed, but repeatable ports can accept any
number of inputs.
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