Fix IntersectWithLine methods for vtkQuadraticWedge and vtkQuadraticTetra.
Part of this fix is an application of a patch by Sascha van Vliet (bug report 0015681). During IntersectWithLine, points within a local instance of a QuadraticTriangle are updated to perform the operation. These points were not being set properly. An additional visual test of intersections for quadractic cells has been added, and a bug in vtkQuadraticWedge was found and fixed.
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