Example program for dtbcon

This example estimates the condition number in the 1-norm of the matrix A, where
A= -4.16 0.00 0.00 0.00 -2.25 4.78 0.00 0.00 0.00 5.86 6.32 0.00 0.00 0.00 -4.82 0.16 .  
Here A is treated as a lower triangular band matrix with one subdiagonal. The true condition number in the 1-norm is 69.62.