2.3.0

Added

• Retrieval of entities via their alternate IDs on the source Ontology.
• Direct edition of entity relationships via the Relationships view.
• __all__ attribute to all modules of the data model.
• RelationshipSet container like TermSet with shortcut attributes and
  proxying of actual Relationship instances.
• Relationship.subproperties and Relationship.superproperties methods
  to add, remove, clear and iterate over the subproperties and superproperties
  of a Relationship instance.
• Ontology.synonym_types method to count (via SizedIterator) and iterate
  over the synonym types of an ontology and all of its imports.
• Ontology.get_synonym_type method to retrieve a single synonym type by ID
  from an ontology or one of its imports.

Changed

• Management of sub-properties / super-properties is now consistent with
  the management of subclasses / superclasses.
• consider, disjoint_from, disjoint_over, equivalent_to, replaced_by
transitive_over and union_of properties of Relationship now return
  a RelationshipSet.

Fixed

• Outdated documentation in Term.subclasses describing the performances of
  the previous algorithm.
• Possible AttributeError with the setter of the Entity.synonyms property.
• Issue with synonym types declared in imported ontologies not being usable
  with synonyms of the actual ontology.
• Various type annotations not updated since version 2.2.2.