As much as possible.
In dnssec ldns_rbtree is inderectly used via the dnssec_zone struct
This change forces use to embed the data in the nodes as getdns_rbtree does not have a data attribute. This is good because lesser allocs and free's and thus slightly faster and less likely to leak memory.
Merged hostname.c and service.c in general so that getdns_general_ns can become static.
Removed specialized synchronous handling from return_validation_chain code.
Removed un_timed_resolve (specialized sync handling is not needed anymore)
Renamed inter-object file symbols to priv_<name> and made intra-object symbols static as much as possible.