### BUG: Fix closed vtkKochanekSpline derivatives at first/last point.

The scaling parameters for nonuniform sampling were miscomputed for the first/last point in closed curves. Also, the code for generating a straight line segment for data with just two points was both unnecessary and incorrect, it ignored the possibility of end-point derivatives generating a curve from just the two points. Change-Id: I5229b839d6d70ba5c44a0fbea45b82ea050d6327

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