More convenience operations (enabkle directly on SLF4J logger); reformat.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1533779 13f79535-47bb-0310-9956-ffa450edef68
Split the recursive evaluation method from the pubolic interface method.
Public -- executeOp(Op,QueryIterator)  [same as before]
Recursive call -- exec(Op,QueryIterator)


git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1533780 13f79535-47bb-0310-9956-ffa450edef68
private -> protected for QueryEngineMainFactory.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1533867 13f79535-47bb-0310-9956-ffa450edef68
TestLoader was being run twice.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1533868 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk