[dune-pdelab] Patches for local operators

[Oliver Sander]

Dear pdelab,
please find attached five patches for dune-pdelab

The first adds a new LocalOperator "Laplace" which does nothing except assemble
the Laplace matrix.  It does not know about boundary values, volume terms or
constraints, and caters to people who value simplicity.

The next two patches use the new operator to simplify the implementation of the
Poisson operator

The last two patches are unrelated; they do some minor cleanup of the LinearElasticity
operator.

I'd be happy if these patches could be applied to the dune-pdelab master branch.

Thanks,
Oliver
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