PCEDT 2.0 Coref release

A version used for building PCEDT 2.0 Coref: generating, and transforming the annotations, preparing the release. This Treex release is used by the ufal/pcedt2.0-coref repository: https://github.com/ufal/pcedt2.0-coref/releases/tag/v1.0.