rely on size-method instead of count-fields.
Merge pull request #736 from ontohub/725-entity_display_name_issue

725 entity display name issue
Merge pull request #727 from ontohub/723-sentence_count_display_correction

rely on size-method instead of count-fields.
fix ontology spec: file deletion
fix onto deletion spec and implementation
Merge branch '755-brittle_spec' into develop