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+Add functions:
+
+gsl_bspline_eval_deriv (see pppack bsplvd) to compute B-spline derivatives
+
+gsl_bspline_smooth to fit smoothing splines to data more efficiently
+than the standard least squares inversion (see pppack l2appr and
+smooth.spline() from GNU R)
+
++ any other useful functions from pppack