[petsc-dev] MatSetFromOptions for MatFactor

[Jed Brown]

It looks like we lost the ability to view factors when we switched to
this model.

  ierr = PetscOptionsViewer("-mat_view","Display mat with the viewer on MatAssemblyEnd()","MatView",&B->viewonassembly,&B->viewformatonassembly,NULL);CHKERRQ(ierr);

Should we have PCLU, PCILU, and similar append the prefix "factor_" and
call MatSetFromOptions if PCSetFromOptions has been called?
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