Python syntax err in glozz-dump
glozz-graph utility

Mostly a visualisation aid to future graph layer work
Make educe.corpus.FileId usable as dictionary key
Make educe.util.add_corpus_filters more flexible

Now allows you to select just a subset of parameterisables
Improve glozz-graph

- Hypergraph internal representation

- Separation between core structure and graphviz visualisation

- Somewhat more helpful output
  (shows speaker, retrieves speech act from unit corpus)