[Patch, Profiler] Profiling of operators

[Daniel Kraft]

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Hi,

this patch implements profiling of operators.  It was not that hard,
after all ... only now the profile_data_accumulator *only* works on the
strings identifying functions and never octave_function references.
This is necessary because (AFAIK) operators don't have any
octave_function corresponding to them.  But it seems to work the way it
is now.

I excluded short-circuit operators, but that is hopefully ok.  The
problem with those is (as mentioned in a comment) that evaluation of
operands and the operator itself is entangled and thus I didn't see
where to start/stop timing the operator to make it reasonable.

Does this look good?  Then the next step is anonymous functions.

Yours,
Daniel

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