[Bf-codereview] White background color for AO and shadow passes (issue 5432072)

[lukas.toenne at googlemail.com]

Reviewers: bf-codereview_blender.org,



Please review this at http://codereview.appspot.com/5432072/

Affected files:
   M     release/scripts/startup/bl_ui/properties_render.py
   M     source/blender/blenkernel/BKE_blender.h
   M     source/blender/blenkernel/intern/scene.c
   M     source/blender/blenloader/intern/readfile.c
   M     source/blender/makesdna/DNA_scene_types.h
   M     source/blender/makesrna/intern/rna_scene.c
   M     source/blender/render/intern/source/pipeline.c
   M     source/blender/render/intern/source/rendercore.c