Example program for dpbcon

This example estimates the condition number in the 1-norm (or -norm) of the matrix A, where
A= 5.49 2.68 0.00 0.00 2.68 5.63 -2.39 0.00 0.00 -2.39 2.60 -2.22 0.00 0.00 -2.22 5.17 .  
Here A is symmetric and positive definite, and is treated as a band matrix, which must first be factorized by dpbtrf. The true condition number in the 1-norm is 74.15.