Consistency of `instance_hypernym`

[jmccrae]

We permit instance_hypernyms for instances of a class of object, normally referring to named entities of a particular class. Thus it makes sense that such instances should not have further hyponyms and that a synset that is a instance hyponym cannot be a non-instance hyponym as well.

There are a few cases where this is broken at the moment

• "Small Magellanic Cloud" (09461312-n) and "Large Magellanic Cloud" (09359177-n) are hyponyms of "Magellanic Cloud" (09368400-n) which is an instance hyponym of "galaxy" (08287963-n). They should be holonyms.
• "mare nostrum" (09369905-n) is a hyponym of "Mediterranean Sea" (09372942-n). They should be synonyms
• "Fury" (09529469-n) has three hyponyms ("Alecto", "Megaera", "Tisiphone") but is an instance hyponym of "mythical creature" (09515254-n). This should be the other way around ("Alecto" is an instance hyponym of "Fury")
• "God Almighty" (09559474-n) is an instance hyponym, but should be a normal hypernym
• "Titan" (09595603-n) has a similar problem to "Fury"
• "British West Indies" (08765327-n) is an instance hyponym of "West Indies" (08764887-n) and should be a holonym
• "Blighty" (08893374-n) is a hyponym of "Great Britian" and should be a synonym
• "Guernsey" (08907571-n) and "Jersey" (08907465-n) are hyponyms of "Channel Island" and should be a holonyms
• "Orion" (09403029-n) is hyponym of "gaseous nebula" but it should be a instance hyponym
• "Isle of Wight (09502368-n) is a hyponym of "county" but it should be a instance hyponym
• "Age of Enlightenment" (08489601-n) should be an instance hyponym of "reform movement"
• "Logrono" (09048869-n) is a hyponym of "Spain" but should be a holonym
• "Alabama" (09075641-n) is a hyponym of "Southern United States" but should be a holonym

This issue should also extend the validation to check that

• No synset has both hypernym and instance_hypernym
• A synset that has an instance_hypernym cannot be the hypernym or instance_hypernym of any other synset