optimize away redundant Request from branch_result signal.
optimize away redundant Request from branch_result signal.

use new targetlist:set_cancelled() instead of overloading
targetlist:set_endresult().


git-svn-id: 3f662d0c7823f96a484d6a9a7c90f2d7866b6747@361 e454d3dc-12ff-0310-9b8b-94264392205f

bernardd/yxa,bernardd/yxa,bernardd/yxa,bernardd/yxa