[Patch, Profiler] First hierarchical data

[Daniel Kraft]

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Hi,

this patch changes the profiler implementation to collect data in
hierarchical form.  The flat profile is then calculated from that data,
so everything works as before.  But in addition, it is now also possible
to get the full call tree -- namely via the second output argument of
__profiler_data.

Currently, there's not yet any function to interpret that on the user
side; but that will be next.  I think this is a nice intermediate stage
to submit a patch.

How does it look?

Yours,
Daniel

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Done:  Arc-Bar-Cav-Kni-Ran-Rog-Sam-Tou-Val-Wiz
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