/etc/namedb symlink is created.
2. Incorporate Brian's suggestion to make the link relative. This
is necessary to handle situations (such as mergemaster) where the
user is building a tree in a seperate environment. This will also
fix the problem with the way DESTDIR is set in 'make release'.
3. Add a new knob, NO_BIND_MTREE, as suggested by the folks who
already have stuff in /var/named that they don't want me to mess with.
4. Update make.conf(5) with the new stuff, and correct a few paths
that have changed since I last updated it.