-MD and -MMD

[Tom Tromey]

I've noticed that neither -MD nor -MMD is documented in invoke.texi.
Is this intentional?  I'm worried that this lack of documentation
might mean that these switches are deprecated.  If that's the case,
I'd like to argue against deprecating them.

I've also noticed that the long forms of these options
(--write-dependencies and --write-user-dependencies) are not mentioned
in the docs.

If this is just an oversight I'd like to know; I'll submit a patch.

Tom