SERRED tests the error exits for the eigenvalue driver routines for
 REAL matrices:
 PATH  driver   description
 ----  ------   -----------
 SEV   SGEEV    find eigenvalues/eigenvectors for nonsymmetric A
 SES   SGEES    find eigenvalues/Schur form for nonsymmetric A
 SVX   SGEEVX   SGEEV + balancing and condition estimation
 SSX   SGEESX   SGEES + balancing and condition estimation
 SBD   SGESVD   compute SVD of an M-by-N matrix A
       SGESDD   compute SVD of an M-by-N matrix A (by divide and
                conquer)
       SGEJSV   compute SVD of an M-by-N matrix A where M >= N
       SGESVDX  compute SVD of an M-by-N matrix A(by bisection
                and inverse iteration)
       SGESVDQ  compute SVD of an M-by-N matrix A(with a 
                QR-Preconditioned )

PATH

          PATH is CHARACTER*3
          The LAPACK path name for the routines to be tested.

NUNIT

          NUNIT is INTEGER
          The unit number for output.

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