V3.1.3 -- Emergency inconcistency hotfix

Version 3.1.3 is a hotfix release that addresses bugs arising from version management in release 3.1.1 and 3.1.2. Several classes and properties from the 3.2 development branch were mistakenly implemented prematurely in 3.1.1 and 3.1.2, causing subtle inconsistencies in the model. Version 3.1.3 reverts all ontology entities to those from version 3.1, while maintaining the REST API specification and edge message examples that were updated since then.

We apologize for providing an inconsistent ontology, and are implementing testing and version management procedures to ensure this does not occur again.