Incompatible changes:
* RRs with mailboxes never rejected due to strange chars if _raw.
* Lack of a mailbox produces `.' not `<>'.
+ * Better usage messages (and no default query domain) for adnstest.
Bugfixes and portability improvements:
* Mailboxes containing spaces in their names are quoted.
* adns_rr_hostaddr naddrs is -1 on temporary failure (as documented).
* Give install the '-c' flag (otherwise some delete the original !).
* Reject TXT RRs with no strings.
+ * Don't complain so much about poll(2) tests if not available.
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