[m-rev.] for review: Reorganise dependency graph code

[Zoltan Somogyi]

On Thu, 16 Feb 2017 12:36:38 +1100, Paul Bone <paul at bone.id.au> wrote:
> > Go ahead; I will fix the typos I found after you commit.
> 
> Okay.

Done; see the attached diff.

Zoltan.


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