Fix deletion specs
Fix deletion specs

a) Some specs created distributed ontologies where the children have
mappings to the other children. This is not intended. These specs only
need a distributed ontology with children.

b) Specs that care about ontologies that import other ontologies do not
need to have import mappings. Any kind of mapping is needed.

ontohub/ontohub,ontohub/ontohub,ontohub/ontohub,ontohub/ontohub,ontohub/ontohub,ontohub/ontohub