[Dune] [#355] Introduce variable "category" in Dune::Preconditioner (ISTL)

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FS#355 - Introduce variable "category" in Dune::Preconditioner (ISTL)
User who did this - Markus Blatt (mblatt)

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There is a way to do it without changing the solver classes:

-Instead of using enums to identify the categories we use empty structs for tagging. (These can even inherit from one another, e.g. overlapping derives parallel).

-Now we can do what I think is called virtual typedef:
   + Precoditioner gets an additional template parameter we is used in its typedef category.
     template<class Cat,class X, class Y>
     class Preconditioner{
     public:
       typedef Cat category
     }
   + And the derived preconditioner set this template parameter accordingly:
     template<class X, class Y>
     class SOR : public<overlapping,X,Y>{};

Any objections?

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