Tests for the ScaLAPACK NEP routines

The PxLAHQR test program generates random upper Hessenberg matrices, completes a Schur decomposition on them, and then tests the resulting Schur decomposition for maintaining similarity. The following tests will be performed on P_LAHQR:

$$r_1 = \frac{\left\Vert H - Q S Q^T \right\Vert} {n \, ulp \, \left\Vert H \right\Vert}$$

$$r_2 = \frac{\left\Vert I - Q^T Q \right\Vert} {n \, ulp }$$

where $Q$ is the Schur vectors of the upper Hessenberg matrix $H$ when the Schur vector and Schur decomposition option is given. $N$ is the order of the matrix, $ulp$ represents PxLAMCH( ICTXT, 'P' ), and the one-norm is used for the norm computations.