Update Jena to 2.10.1

Please merge this into your mainline branch. Jena 2.10.1 includes some important fixes (for instance https://issues.apache.org/jira/browse/JENA-437) and is otherwise (mostly) compatible. The only incompatibility is that the visibility of the field `isPrepared` in class `com.hp.hpl.jena.reasoner.BaseInfGraph` was changed to `private` so `PelletInfGraph` has to use the accessors and setters from the super class.