erse;
          = 'O':  only computes the new columns / rows for the
                  Cholesky factor R of T.

  TYPET   CHARACTER*1
          Specifies the type of T, as follows:
          = 'R':  the first block row of an s.p.d. block Toeplitz
                  matrix was/is defined; if demanded, the Cholesky
                  factors R and L are upper and lower triangular,
                  respectively, and G contains the transposed
                  generator of the inverse;
          = 'C':  the firs