SLCTES returns .TRUE. if the eigenvalue (ZR/D) + sqrt(-1)*(ZI/D)
 is to be selected (specifically, in this subroutine, if the real
 part of the eigenvalue is negative), and otherwise it returns
 .FALSE..
 It is used by the test routine SDRGES to test whether the driver
 routine SGGES successfully sorts eigenvalues.

ZR

          ZR is REAL
          The numerator of the real part of a complex eigenvalue
          (ZR/D) + i*(ZI/D).

ZI

          ZI is REAL
          The numerator of the imaginary part of a complex eigenvalue
          (ZR/D) + i*(ZI).

D

          D is REAL
          The denominator part of a complex eigenvalue
          (ZR/D) + i*(ZI/D).

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