[dune-pdelab] PGFS with 1 component

[Christian Engwer]

Hi Pavel,

>your code works, but if you change Dune::PDELab::ISTLVectorBackend<>
>(default no blocking) to
>Dune::PDELab::ISTLVectorBackend<Dune::PDELab::ISTLParameters::static_blocking>
>(as in Martin's code), it breaks.
>
>Does it make a sense use static_blocking with blocksize 1?

In generic cover it does. Consider a general reaction diffusion system... Why should you're code fail for one component?!

Or your stokes code... Why should it fall in 1d?.. At least for debugging it is still interesting!

Christian