HPCC-9410 Add superfile information to control:getQueryXrefInfo

Also extends getQueryFiles service to handle new information.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4454 from richardkchapman/roxie-xref

HPCC-9410 Add superfile information to control:getQueryXrefInfo

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>