also, assumption failure is checked explicitly.

Conflicts:
	ChangeLog
	src/bin/dhcp6/dhcp6_messages.mes

Instead, make the one that returns ConstRRsetPtr virtual.

the latter doesn't always work.

this will simplify the generation process and Makefile syntax.

so it won't report misleading success reports for other data sources.

It's not used anywhere else in the source tree any more.  okayed on jabber.

this is necessary to keep the previous behavior for FreeBSD where -Werror
is automatically disabled due to other bug of the compiler.
discussed on jabber, not seen a clear go, but I'm committing it at my
discretion to fix the buildbot errors.  I've confirmed the behavior on
multiple FreeBSD boxes.

It was handled in implemented in changelog #359 trac 1462 of Jan. 2012.

Okayed on mailing list:
See https://lists.isc.org/pipermail/bind10-dev/2012-December/004186.html