[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 - Carsten Gräser (Carsten)

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The arguments for FV<FV> seem to be:
1) We need more complex types then FM in general.
2) We want the type to behave like a FV for scalar basis functions.

@1) Even if you want to mimic a tensor structure array<FV> is more appropriate since FV<FV> pretends that it provides some kind of algebra which is not true. FV<FV> even only compiles since templates are not type-safe.

@2) FV<FV,1> does only behave like FV in special situations due to the implicit cast. This boils down to save some [0]. In my opinion a consistent type is more important then this (even if I only use scalar basis functions).

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