[petsc-dev] please do not replicate PETSc object options in examples

[Barry Smith]

  For example,

     ierr = PetscOptionsGetReal(PETSC_NULL,"-dt",&dt,PETSC_NULL);CHKERRQ(ierr);
     ierr = TSSetInitialTimeStep(ts,0.0,dt);CHKERRQ(ierr);

  since TSSetFromOptions() already has the option -ts_dt  there is no reason 
for the examples to provide the option.

  Etc Etc.

   Thanks


   Barry