Don't register the dummy dataset reference.
It should not show up in "list all datasets" and so appear in the UI.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1531283 13f79535-47bb-0310-9956-ffa450edef68
Fix - set context on dataset, not dft graph.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1531284 13f79535-47bb-0310-9956-ffa450edef68
Add operation to note end of iterator.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1531352 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk