[ODE] Geom offset when not attached to a body

[Arturo Colorado Garín]

Thanks Jon and Remi for your replies. I've finally done all the geom 
offset/transformation "by hand" and it works fine.

But the truth is that I don't see why a body is needed for the offset 
feature at all. Maybe I'm missing something but I thought the geom offset 
was a simple transformation applied just before the actual geom 
transformation, being this one the one taken from its body OR its own 
internal transformation. In fact, this is exactly what I'm doing in my code.

Comments are welcome.

--Arturo.