Add owl:Ontology element

The OWL files are missing owl:Ontology elements. These should have:

• an Ontology IRI (in the rdf:about attribute)
• an Ontology Version IRI
• a title
• a description
• a license

I filled this information from the OBO registry entry for FIDEO. The version IRIs aren't ideal, but to do a better job requires changes to the OBO PURL system configuration for FIDEO.

I did not have permissions to make a Merge Request, so I'm attaching the modified files to this issue.

• fideo.owl
• fideo_core.owl