Problem and Solution PolyGroups in Blender 2.72 for Export Objs

ajd_at_072df9a27d

In Blender 2.72 problems with the export (Wavefront Object)of objs with option polygroups, which helps to export clothes, figures, or props to Daz Studio and Poser.
Polygroups helps you group the faces of the object, and is vital to the figures.

The solution is to apply the following patch: Fix for Bug
https://developer.blender.org/T31839
https://developer.blender.org/file/data/jcsyqsfld3ujaoejoev7/PHID-FILE-mkaiaqxkxmkcrcocweii/export_obj.polygroups.patch

I really do not like the patch is applied automatically but manually is:
compare two versions:
Blender Foundation \ Blender-2.72 \ 2.72 \ scripts \ addons \ io_scene_obj\export_obj.py
Sign - the whole line is removed
Sign + whole line is added

The biggest problem are the spaces or tabs, Python is very picky.
I'll try to see if I can raise the already modified file somewhere, and trouble license for that.

Advantages Blender
Decimate - Reduction of polygons
Disposal of repeated vertices - Merge, merge automatic
Automatic Weld - Remove Doubles
Do not miss Groups vertices and textures after removing vertices or faces.