[Patch] Profiler update, interface function

[Daniel Kraft]

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Hi,

after today's discussion, here's an update for my profiler.  I greatly
extended the data collection done in profile_data_accumulator, and also
added a .m-file function which provides 'profile' to the user.

It has an interface similar to Matlab's profile function (at least I
hope that also Matlab users will see it so), but only supports some of
the options the Matlab version has and also produces only parts of the
outputs.

I hope that the new data collection (which looks through the call-stack
and also keeps track of child/parent functions) is not too expensive to
do at possibly every function call; what do you think?  But I don't see
how we could do it any other way and still get the output Matlab gives.

BTW, IsRecursive in my patch returns true iff at some point, the
function called was already somewhere on the call-stack; so foo below
will be recursive:

function r = foo (a)
  r = bar (a);
end

function r = bar (a)
  if (a == 0)
    r = 1;
  else
    r = a * foo (a - 1);
  end
end

Or should only functions be recursive where the function itself is a
direct parent/child?  The implemented behaviour seems more reasonable to
me (and is for instance what RECURSIVE in the Fortran standard means),
but I don't know what Matlab does.

What do you think about this patch?

Besides obviously correcting it for things that turn up, I think I'll
try to look into profiling of operators and fixing the anonymous
functions next.  Hm, or maybe implement a flat-profile "nice" output
routine first, because without one, I don't think the current profiling
information is of much use to an end-user in the structure format at the
moment.

Yours,
Daniel

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