Thanks to Tony Finch for the program and the performance figure.
* New internal consistency checking with assert if right options set.
* New adns_wait_poll function like adns_wait but uses poll, not select.
- * New adnshost utility - currently only a usage message :-).
+ * New adnshost utility - very alpha.
Incompatible changes:
* RRs with mailboxes never rejected due to strange chars if _raw.
* Do not scramble innards when a query on the output queue is cancelled.
* Do not close tcp socket twice.
* Mailboxes containing spaces in their names are quoted.
+ * Give ESRCH, not EAGAIN, if _check called with no queries outstanding.
* adns_rr_hostaddr naddrs is -1 on temporary failure (as documented).
* Reject TXT RRs with no strings.
* Correct error messages for qname CNAME foo, foo CNAME bar.