Fix domain and range retrieval methods

[alkidbaci]

The following methods of Structural Reasoner search for "super_classes" when direct = False:

• data_property_domains
• object_property_domains
• object_property_ranges

Instead they should search for "sub_classes".
Explanation: "rdfs:range" and "rdfs:domain" are restrictions for the specified property and as such it makes no sense that non-direct ranges/domains are extended to super classes because it contradicts the purpose of the restriction in the first place. As non-direct ranges/domains we should consider the subclasses of the specified range/domain.

data_property_ranges is missing and should be added.