preferences: implemented check_parallelism()
added node_attrs() helper method to Pocores
fixed token_dict call in Pocores._get_entity_grid()
main: added missing import
main flake8: spacing
main flake8: is None
filters.py: used node_attrs() instead of direct access to docgraph
preferences.py: used node_attrs() instead of direct docgraph access
filters: implemented check_role()
preferences: implemented get_chain_length()
preferences: implemented get_depth() based on conll.traverse_dependencies_up()
filters.py: fixed variables, spacing