[Fluxus] save-primitive improvements

[gabor papp]

hi all,

savannah git is back. i pushed some improvements of (save-primitive).
now it also saves the children of the polyprimitive. locators create 
groups in the obj file. so you can save the whole scene in an obj file 
if the primitives are in a hierarchy. very basic material support is 
added. for each object the colour information is saved in an .mtl file 
next to the .obj.

screenshot in fluxus and blender:
http://www.flickr.com/photos/gaborpapp/5218623320/

using this, gaspar managed to load a scene i exported from fluxus and 
rendered it in v-ray:
http://www.flickr.com/photos/gaborpapp/5220480732/

best,
gabor