Difference between SeqILU and SeqILU0 is not documented
dune/istl/preconditioners.hh contains the implementations
SeqILU0. Their implementations are quite different, but from their names alone I would guess that they do the same thing. Are they really supposed to do the same thing? If yes, why do we have to implementations? If not, what is the difference?
If I get a good explanation here in this thread I volunteer to update the documentation.