CLCTES returns .TRUE. if the eigenvalue Z/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 CDRGES to test whether the driver
 routine CGGES successfully sorts eigenvalues.

Z

          Z is COMPLEX
          The numerator part of a complex eigenvalue Z/D.

D

          D is COMPLEX
          The denominator part of a complex eigenvalue Z/D.

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