[Dune] [#700] Remove C0LocalBasis base class and traits

[Dune]

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FS#700 - Remove C0LocalBasis base class and traits
User who did this - Carsten Gräser (Carsten)

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Oliver and I would also prefer Andreas suggestion as summerized below.

* There is one 'template <int maxDerivOrder> class VirtualLocalBasisInterface'.
* It contains 'evaluateFunction(...)' AND 'evaluateJacobian(...)' for all maxDerivOrder.
* It contains 'evaluate(const Dune::array<int,k>&,...)' for k=0,...,maxDerivOrder.
* 'VirtualLocalBasisInterface<k>' derives from 'VirtualLocalBasisInterface<k-1>'
* There is only one LocalBasisTraits template

There are still the following open questions:

1) Should 'evaluate(...)' methods for k=0 always exist ?
If yes we must implement them in all FEs.

2) Should maxDerivOrder be part of LocalBasisTraits or handed to the interface seperately ?

3) How should the maxDerivOrder enum be called ?

I'd suggest:
@1) Yes, but provide a default default implementation in the interface using 'evaluateFunction(...)' as temp workaround 
@2) It should be part of the Traits, i.e. CkLocalBasisTraits becomes the new LocalBasisTraits
@3) As the jacobian is always there 'maxPartialDerivativeOrder' would be more precise but the current 'diffOrder' would be nicer

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http://www.dune-project.org/flyspray/index.php?do=details&task_id=700#comment1621

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