[m-rev.] for review: new machinery in make.dependencies.m

[Zoltan Somogyi]

For review by anyone. I am particularly seeking feedback
on whether you guys think the few test cases for which the
old/new comparison in the diff detected changes are
indicative of a problem with this diff, or not. (I have looked
at it and couldn't decide, maybe you have some ideas
I have overlooked. The failure reports for two of the
test cases are attached; the others are similar.)

I am also depending on you guys to test out this diff
on real code, since you work with code bases using mmc --make,
which I don't do. I would also like to know whether you want to
do such tryouts before this diff is committed, or after.

Zoltan.
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