Example program for dgbbrd

This example reduces the matrix A to upper bidiagonal form, where
A = -0.57 -1.28 0.00 0.00 -1.93 1.08 -0.31 0.00 2.30 0.24 0.40 -0.35 0.00 0.64 -0.66 0.08 0.00 0.00 0.15 -2.13 -0.00 0.00 0.00 0.50 .