Subtract off a coarse adjoint in ARefEE

This shouldn't change the global error estimate, but should hopefully
give us a more suitable local indicator for adaptive refinement.
Copy vector, don't reassign pointer

Bugfix for previous commit
Make sure coarse/fine adjoint ParallelTypes match
Merge pull request #313 from libMesh/adjoint_refinement_projection

Subtract off a coarse adjoint in ARefEE