Profiler: Implement output function 'profshow'

[Daniel Kraft]

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Hi,

this is a follow-up patch on my last profiler changeset (which
implemented profile.m).  This adds a function 'profshow', which can be
used to print a simple flat-profile table.  As far as I understood the
thread about Matlab output, there's no equivalent function(ality) there,
so I hope my implementation is useful and looks ok.  But of course,
comments welcome!

In particular, I have two questions:

* Should I also print the 'IsRecursive' flag in the table?  While it
does not really fit into a flat profile table (IMHO), this would be a
good place to show it.

* In general for the profiler, should I add tests?  I'm much in favour
of testing as much as possible, but I'm not sure how to do this best.
Maybe by some hierarchy of test-functions which call sleep at some
points?  And then compare the profiler output with expected times up to
some "epsilon"?

Yours,
Daniel

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To go: Hea-Mon-Pri
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