-Added Distance based Depth of Field (not object based yet)

-Noticed a bug when parts of an object are flat shaded and other parts smooth shaded, not solved this yet.

I had forgotten to change some names I hope it does work  now; This is an adaptation of Povray exporter to render with povray 3.7 
if you want more info, there are pdfs in the zip files here on the tracker: https://projects.blender.org/tracker/index.php?func=detail&aid=22717&group_id=153&atid=468

These scritps still need changes related to parent classes
- mesh_surface_sketch.py
- render_renderfarmfi.py
- space_view3d_align_tools.py
- object_cloud_gen.py

After discussion with Campbell I've made povray an addon as a package (will remove from bf-blender).
Please roport any glitch or mistake I might have done while porting.