* New adns_errabbrev() for getting status abbreviation strings.
* regress/checkall prints summary list of failed tests, if any.
* Event loop functions for poll(2), and some raw variants.
+ * adnstest has ability to use poll(2), and user can set initflags.
+ * checkall prints passed list as well as failed list, if any failed.
Bugfixes:
* Non-RFC822 mailbox `domain' formatting now works, and clarified.