Example program for dstevd

This example computes all the eigenvalues and eigenvectors of the symmetric tridiagonal matrix T, where
T = 1.0 1.0 0.0 0.0 1.0 4.0 2.0 0.0 0.0 2.0 9.0 3.0 0.0 0.0 3.0 16.0 .