add numerical recipes library

lib/nr/ansi/recipes/splie2.c

@@ -0,0 +1,9 @@
+
+void splie2(float x1a[], float x2a[], float **ya, int m, int n, float **y2a)
+{
+	void spline(float x[], float y[], int n, float yp1, float ypn, float y2[]);
+	int j;
+
+	for (j=1;j<=m;j++)
+		spline(x2a,ya[j],n,1.0e30,1.0e30,y2a[j]);
+}