Graphics Layout Engine support

I hacked up the doxygen source to add support for GLE.

http://glx.sourceforge.net/
(there is an examples link on that site that shows some
of the functionality of GLE... some of it might be very
useful for code documenation and compiments the
functionality provide by graphviz I think).


I don't know my way around the doxygen code base, so
my changes are ugly and likely non portable, but I suspect
somebody that knows what they're doing could fix it up
pretty quickly (although they could probably do it from
scratch pretty quickly too).  Anyway, is there interest in
adding this to the stock doxygen code base?

Basically, I copied dot.cpp to gle.cpp and replaced dot
with gle in that file with a few exceptions relating to
config setting which I didn't make independent of DOT
configuration.  I also make a few changes to work around
differences in the dot versus gle syntax.  Then I more or
less blindly copied a bunch of code in other files that
related to DOT and made a GLE equivalent.

It works on my Linux system, but one of my
workarounds for gle behavior is probably not
portable.  Is there interest in my submitting what I've
done?  If so, where/how?

Thanks...
                 David

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