dns-mode.el vs. zone-mode.el

[Romain Francoise <romain@orebokech.com>]

Emacs 22 has a new package called dns-mode.el which does pretty much the
same thing as an older package called zone-mode.el, the latter being
part of Emacs since (at least) Emacs 20.

They are so simple that we probably don't need two packages for this.

Comparing the two yields the following observations:
- dns-mode's code to update serials is more advanced and probably more
  robust;
- dns-mode's font-locking is much better;
- zone-mode updates serials automatically upon saving, via
  `write-file-functions';
- dns-mode has a menu (but it has only one item so far);
- dns-mode associates itself with .soa files in `auto-mode-alist'.

So I'm proposing to merge the two by dropping zone-mode.el, making
zone-mode an alias for dns-mode, and making dns-mode update serials
automatically upon saving (so as not to confuse users of zone-mode).

What do people think?

-- 
Romain Francoise <romain@orebokech.com> | The sea! the sea! the open
it's a miracle -- http://orebokech.com/ | sea! The blue, the fresh, the
                                        | ever free! --Bryan W. Procter