A Matrix Representation for Spline Basis Functions

Provides the functional outer product of second derivatives of a set of basis functions in a SplineBasis object. It a convenient form for forming a penalty on curve smoothness when fitting a spline curve.

1 | ```
OuterProdSecondDerivative(basis)
``` |

`basis` |
A SplineBasis object |

A square matrix of order nrow(basis).

Andrew Redd <aredd at stat.tamu.edu>

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