Make sure appositives in coref are handled properly

[nschneid]

The Stanford coref tool seems to be marking the base NP as coreferent with a larger NP containing the appositive. Probably want to just mark the appositive separately.

[nschneid]

Relatedly: with a copula predication between two nominals, the copulas and coref modules interact to produce a concept whose :domain is itself. Should probably avoid marking such things as coreferent, but it's unclear whether a coreference categories (like appositive vs. anaphora) are available from the Stanford tool.

[nschneid]

Hacky solution in coref: look for :domain links before merging members of coreference clusters.

[nschneid]

In "stanford_coref" for wsj_0003.19:

      [
        "University of Vermont College of Medicine", 
        47, 
        53
      ], 
      [
        "the University", 
        46, 
        48
      ]
    ], 

Is this a problem in the coref extraction (beyond appositives)?