[osg-submissions] static-transform eradicating flattener

[Terry Welsh]

Here's my flattener that wipes out static transforms and duplicates
subgraphs as necessary.  If you have a model with a lot of static
transforms, this may make it run faster at the cost of a lot more
memory.  My models got about a 25% framerate improvement.

This works with some pretty complex models that I have tried it on,
but I'd be surprised if I thought of every possible corner case.  I
hope other people can try it out.  Sorry I didn't include a demo
application, but that stuff is all secret and stuff.  It's a simple
visitor so it's easy to add to existing code.

Before it gets rolled into Optimizer it will need a better name, and
there might be ways to have better code reuse (some of the functions
are quite similar right now).
-- 
Terry Welsh - mogumbo 'at' gmail.com
www.reallyslick.com | www.mogumbo.com
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