[osg-submissions] Fixes in osgShadow::ShadowMap

[Sebastian Messerschmidt]

Hi,

I've merged my changes with the current SVN and experienced some strange 
things too.
Wojciech I think has added negative polygonoffset when culling back 
faces. This leads to selfshadowing everywhere on my ATI card.
When supplying positive values however it works on ATI and NVIDIA (when 
choosing a bigger value though)

I've attached the merge as is, since my changes involve a function to 
set the polyoffset from outside (see attached description for further 
details).
I also agree to Robert, that we need definitely more unit tests for 
this, but I have that strange feeling, that won't be enough, since I had 
very different experiences with different card/driver combinations. 
(e.g. ATI .. they have inverted the t-coordinate of the FBO-Texture in 
their newest drivers ...)

I hope my changes are of any value.

cheers
psy
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