[dune-pdelab] dune-pdelab | Get rid of numerical_jacobian (#45)

[Oliver Sander]

New comment for Issue 45

http://conan2.iwr.uni-heidelberg.de/git/pdelab/dune-pdelab/issues/45#note_1681


Author: Oliver Sander

I vote for a), for the following reasons:
- It is least invasive -- the actual local operators don't have to be extended / modified.
- It allows for more than one implementation of a numerical Jacobian.  This is useful because people may want to choose between different algorithmic-differentiation implementations, FD approximations, or may complex-step FD.

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