Remove jena-text:sources dependency.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1516809 13f79535-47bb-0310-9956-ffa450edef68
Backup action was not setting the DatasetRef.  The DatasetRef now has to be set explicitly (makes procesisng normal SPARQL requests cleaner - a change elsewhere).

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1516814 13f79535-47bb-0310-9956-ffa450edef68
Remove unused imports.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1516852 13f79535-47bb-0310-9956-ffa450edef68
JENA-517

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1516894 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk