Fix issue 632 (BrickSchema#635)

* Use pyontoenv package for environment management

This is faster and more rigorously tested than the old environment
management package.

* update bacnet ontology

* make sure aliases also have subclasses

* add test for issue 632

* fix the sparql query

* got the logic backwards

* remove the "root" classes

generate_brick.py

@@ -341,6 +341,10 @@ def define_classes(definitions, parent, pun_classes=False, graph=G):
             graph.add((alias, A, OWL.Class))
             graph.add((alias, A, SH.NodeShape))
             graph.add((alias, OWL.equivalentClass, classname))
+            # find parent class of what the alias is equivalent to, add the RDFS subClassOf properties
+            parent_classes = list(graph.objects(subject=classname, predicate=RDFS.subClassOf))
+            for pc in parent_classes:
+                graph.add((alias, RDFS.subClassOf, pc))
             graph.add((alias, BRICK.aliasOf, classname))
 
         # all other key-value pairs in the definition are