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

[Dune]

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The following task has a new comment added:

FS#700 - Remove C0LocalBasis base class and traits
User who did this - Jö Fahlke (joe)

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I always understood that piecewise-C0 was meant when C0 was written in dune-localfunctions, likewise for C1 and Ck.  The different C*LocalBasisInterface classes define different interfaces: C0LocalBasisInterface supports only evaluateFunction() and evaluateCoeffs().  C1LocalBasisInterface adds evaluateJacobian() and friends which are simply not present in C0LocalBasisInterface.  CkLocalBasisInterface add methods for arbitrary derivatives, which are present neither in C0LocalBasisInterface nor in C1LocalBasisInterface.  So the difference between these classes is more a matter of API than of mathematics.

C1LocalBasisTraits adds the JacobianType typedef to C0LocalBasisTraits, so this is again a matter of API.

So the question is: are the any algorithms which need to do different things *at compile time* based on whether a LocalBasis supports Jacobian or general differentiation?  Do we require Jacobian and/or general differentian methods for all local bases?

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