[Dune] [#820] Encapsulate scalars of type T in Field<T>

[Dune]

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FS#820 - Encapsulate scalars of type T in Field<T>
User who did this - Markus Blatt (mblatt)

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> Regarding the 'work for the user': BlockVector<Field<T> > seems to be simpler and much more natural than BlockVector<FieldVector<T,1> >

And now we have the recursion level problem again. I was under the impression that one has to write BlockVector<FieldVector<Field<T> > >.
Let us pretend we skip Fieldvector for the scalar case. If we take Olivers suggestion that Field has blocklevel -1, then BCRSMatrix<Field<T> > has block level 0, for a system we have BCRSMatrix<FieldMatrix<Field<T>,n,n> > which has in blocklevel 1. Where should the recursion end? If it ends at -1 we always invert at the scalar level. => No performance gain for the system case. If we stop at 0 we need to invert a BCRSMatrix...
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