+ Documentation improvements:
+ * Security/performance note added, about local nameservers and DNSSEC.
+ * Documented that adns_rr_info _rr_hostaddr ( ) for address list
+ means permanent failure, and ? means temporary failure.
+ * Typo (*now for now in _beforeselect description) in adns.h fixed.
+
+ Changes to produce more defensive code:
+ * In adns_wait, assert that the timeout is not infinite.
+ * Make qu->id start out as -2 when initially allocated.
+