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

[Dune]

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FS#522 - Jacobian type is FieldVector< FieldVector< K,m> >
User who did this - Peter Bastian (peter)

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1) The reason for this was that in a diffusion equation you have to compute B*grad phi
where B is jacobianInverseTransposed and phi is a scalar-valued basis function. Admittedly one should not
define interfaces such that they work good for a special case. Nevertheless, it was nice.

2) That brings out a deeper problem. What will you actually do with the derivatives of the basis functions?
I think its not just "its a jacobian, so it must be a matrix". E.g. with mixed fe you need to evaluate the divergence, which is the sum of the diagonal entries. Therefore: We should discuss in more detail what we need.

3) Changing this will break our whole code. Therefore, "if there are not comments I'll change it in the near future" is not a good thing to do!
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http://www.dune-project.org/flyspray/index.php?do=details&task_id=522#comment991

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