Bugfixes:
* Do not fail assertion if _qf_owner, _qf_search, domain ends in `.'.
* Avoid infinite timeouts, causing lockup, when they should be zero !
+ * TCP handling revamped (avoids recursive-invocation problems).
* Dynamic library building works properly.
* adnshost prints somewhat better messages about some wrong usages.
* Include stdlib.h in adnshost.h.