                Otherwise, this entry is ignored.
          BPAR(4) = .TRUE.  : Q is returned.
          BPAR(4) = .FALSE. : Q is returned in factored form, i.e.,
                              C and W from (II) are returned.
          BPAR(5) = .TRUE.  : The matrix returned in array Q (i.e.,
                              Q if BPAR(4) = .TRUE. and W if
                              BPAR(4) = .FALSE.) is stored as full
                              matrix.
          BPAR(5) = .FALSE. : The matrix returned in 