OBJ export broken for 3dm files made in old MoI versions.

 From:  Michael Gibson
1169.8 In reply to 1169.7 
Hi Pilou, this patch only fixes the triangulation bug that was creating improper UV coordinates in certain circumstances, nothing else.

I still have a few other things that I want to add before V1 final, so there should be another patch or another beta (not sure which) before the final launch.

- Michael