HPCC-11808 Missing alias information from control:queries

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
It make more sense, and answers some questions if it says Alias rather than Query.

What happens though if a tree node is added via

    destQueries->addPropTree("Alias", LINK(srcQuery));

and then has a subsequent

    mergeTree(prev, new);

won't that update attributes in the original linked tree - potentially corrupting that tree?