JENA-513 : Move the batch delete code from GraphTDB to DatsetgraphTDB.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1514244 13f79535-47bb-0310-9956-ffa450edef68
Reformat

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1514247 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk