'next' was sometimes overwritten when it should not have been
causing NEEDNOTIFY to be effectivly ignored.

bison-generated parsers

to ensure that log files specified in named.conf are created as
the unprivileged user

eliminate compiler warning

won't work until the server returns keys/nxts from the parent zones.
Also some style fixes.

records in the answer, since they might be in an unsecure subdomain.

enforced on input

Generate NOTIFY messages.

memset task->name.

dns_resolver_socketmgr().

requestmgr now has internal and external reference counts.
mctx is now attached / detached.
send shutdown events once all requests have completed.
dns_request_create now fails if the manager is exiting.
dns_dispatch_detach(dispatchv6).

fix a bug where ev_sender wasn't properly set, and convert sender, arg, action, etc. to ev_sender, ev_arg, ev_action, etc.

do range checks before verify, since it's faster.

for positive validations, but does not yet handle things like shutdown
correctly