add numerical recipes library

lib/nr/k_and_r/recipes/slvsml.c

@@ -0,0 +1,10 @@
+
+void slvsml(u,rhs)
+double **rhs,**u;
+{
+	void fill0();
+	double h=0.5;
+
+	fill0(u,3);
+	u[2][2] = -h*h*rhs[2][2]/4.0;
+}