[Dune] DUNE::SeqILU0 craches for some matrices

[Thomas Witkowski]

Hello,

for some matrices DUNE::SeqILU0 crashes the whole machine with a 
segmentation fault. I've made a very small example to show the problem. 
Why it works for matrix B but not for matrix A? I'm using DUNE 1.0beta7

Regards,

Thomas
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