VIVO-773 remove references to IRI-0.8 library.

Converted to 0.9.6
Merge branch 'develop' of git+ssh://github.com/vivo-project/Vitro into develop
VIVO-773 Add a Context to RDFServiceDatasetGraph.

Every attempt at SPARQL Update fails because RDFServiceDatasetGraph.getContext() returns null.
I see that DatasetGraphBase just creates an empty Context on instantiation, so now RDFServiceDatasetGraph
does the same, and the problem goes away.
VIVO 746, at startup, remove obsolete Permissions from the user accounts model.

Also, get rid of UpdatePermissionSetUris, which supported the transition from 1.4 to 1.5.
VIVO-784 remove duplicate results from "show statements".

The clause to include statements in the default graph was showing everything twice, without filtering the statements in the named graph. Don't know why. Talked with Brian, and decided to remove it.