[petsc-dev] Chebyshev hybrid option has no functional interface or man pages

[Barry Smith]

  There should be a functional interface for turning this on and off with a manual page.

   Barry

  /*
   Use hybrid Chebyshev.
   Ref: "A hybrid Chebyshev Krylov-subspace algorithm for solving nonsymmetric systems of linear equations",
         Howard Elman and Y. Saad and P. E. Saylor, SIAM Journal on Scientific and Statistical Computing, 1986.
   */
  ierr = PetscOptionsBool("-ksp_chebyshev_hybrid","Use hybrid Chebyshev","",cheb->hybrid,&cheb->hybrid,NULL);CHKERRQ(ierr);
  ierr = PetscOptionsInt("-ksp_chebyshev_hybrid_chebysteps","Number of Chebyshev steps in hybrid Chebyshev","",cheb->chebysteps,&cheb->chebysteps,NULL);CHKERRQ(ierr);
  ierr = PetscOptionsInt("-ksp_chebyshev_hybrid_eststeps","Number of adaptive/est steps in hybrid Chebyshev","",cheb->eststeps,&cheb->eststeps,NULL);CHKERRQ(ierr);
  ierr = PetscOptionsBool("-ksp_chebyshev_hybrid_purification","Use purification in hybrid Chebyshev","",cheb->purification,&cheb->purification,NULL);CHKERRQ(ierr);