s whether A and/or B is/are in Schur or
          Hessenberg form as follows:
          = 'A':  A is in Schur form, B is in Hessenberg form;
          = 'B':  B is in Schur form, A is in Hessenberg form;
          = 'S':  Both A and B are in Schur form.

  ULA     CHARACTER*1
          Indicates whether A is in upper or lower Schur form or
          upper or lower Hessenberg form as follows:
          = 'U':  A is in upper Hessenberg form if ABSCHU = 'B' and
                  upper Schur form otherwise;
   