[Dune] [#522] Jacobian type is FieldVector< FieldVector< K,m> >

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FS#522 - Jacobian type is FieldVector< FieldVector< K,m> >
User who did this - Uli Sack (usack)

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In my opinion suggestion 2) is prefereable. Firstly because FieldVector is not supposed to be nested in the first place, and secondly because a FieldVector<FieldVector,double,N>,M> simply doesn't work as expected. A very simple example:

Dune::FieldVector<Dune::FieldVector<double,3>,1> a(Dune::FieldVector<double,3>(0.0)),b;
b=a;
a==b;

Compiler error:
test.cc: In function ‘int main()’:
test.cc:41: error: no match for ‘operator==’ in ‘a == b’

Lastly, if full jacobian matrices are supported (meaning for vector valued basis functions) I expect them to behave like matrices including linear algebra functionality. 

Therefore I agree with Carsten and support a switch to FieldMatrix in the JacobianType for the LocalBasisTraits.
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