[cmake-developers] Improving GraphViz output, clustering

[Aleix Pol]

Hi,
I've been trying to get a good outlook of the internal dependencies of one
of our projects (KDE Frameworks 5).

One thing that I've found useful is adding clustering to external
dependencies that, while needed in the graph, having them grouped as a
separate entity is desirable.

Attached, I'm providing a patch that adds this functionality. I hope you
find it useful.

Aleix
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