[Dune] [#928] breakdown of BiCGSTAB

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FS#928 - breakdown of BiCGSTAB
User who did this - Markus Blatt (mblatt)

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Does your right hand side make sense from the physics of the problem.

Whenever this happened to us, the discretisation was wrong. Most often the left and right hand side are not compatible in terms of boundary conditions if breakdowns occur.

try e.g. X=0; x[0:8] = -1e+05; which makes more sense and satisfies BiCGSTAB!

With BiCGStab breakdowns may occur. But this is rather a problem of the algorithm than our implementation.
If CG works, you should therefore use it.

Did you also check bicgstab in matlab?
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