- removed unused _node iterator value from rbtree_t. Takes up space.
- iterator can handle querytargets state without a delegation point
set, so that a priming(stub) subquery error can be handled.
- iterator stores if it is priming or not.
- log_query_info() neater logging.
git-svn-id: https://unbound.nlnetlabs.nl/svn/trunk@418 be551aaa-1e26-0410-a405-d3ace91eadb9