[Bf-codereview] User preferences separate from default .blend (issue 6307057)

[jorge at lunarworkshop.com]

Reviewers: bf-codereview_blender.org,

Description:
User preferences separate from default .blend

Please review this at http://codereview.appspot.com/6307057/

Affected files:
    M    .
   M     release/scripts/startup/bl_ui/space_userpref.py
   M     source/blender/blenkernel/BKE_global.h
   M     source/blender/blenkernel/intern/blender.c
   M     source/blender/blenlib/BLI_path_util.h
   M     source/blender/blenloader/intern/writefile.c
   M     source/blender/windowmanager/WM_api.h
   M     source/blender/windowmanager/intern/wm_files.c
   M     source/blender/windowmanager/intern/wm_init_exit.c
   M     source/blender/windowmanager/intern/wm_operators.c