[Dune] calling ISTL solvers for dense matrices

[Christian Engwer]

Dear all,

in complexmatrixtest ISTL krylov solvers are called for FieldMatrix
and FieldVector. Is this a feature we want to support? I was a bit
surprised and bitten by this usag. I tried to make ISTL work with
custom allocators, but this requires the solvers to ask for the
allocators in the vector in order to properly rebind te allocator for
internal data. This obviously fails for FieldVector, as it doesn't
need any allocator.

Any comments?

Ciao
Christian