starting from version 2.64. Unless you have a special system setup, this means the
will be in ~/.config/blender rather than ~/.blender.
When the version number is changed to 2.64, the "Copy Previous Settings" operator
in the splash will copy the settings to the new location.
XDG base directory specification:
http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
Slightly modified to better fit in architecture (moved to related GHOST SystemPaths)
Thanks to Harley Acheson for the research and for providing the original patch.
Note: I added empty function for X11(Linux) and Mac (Carbon and Cocoa) to be implemented still.