Update testGCVSpline.cpp so it tests that input data points are recoverable to SimTK::SignificantReal. Interpolating should be accurate to within the h^2. Verify that derivatives are correctly computed. Also verify that derivatives calculations are perfectly repeatable.
Update testGCVSpline.cpp so it tests that input data points are recoverable to SimTK::SignificantReal.
Interpolating should be accurate to within the h^2.
Verify that derivatives are correctly computed.
Also verify that derivatives calculations are perfectly repeatable.

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