Revert to the FUTURE_PYTHON_API, this means:

- switching the define on in buildsystems (NaN, auto and msvc are done)
- again import _Blender, which is the C module, from the Python modules

intern/python/modules/Blender/Window.py

@@ -4,7 +4,7 @@ This module currently only supports redrawing commands of windows.
 Later on, it will allow screen manipulations and access to Window
 properties"""
 
-#import _Blender.Window as _Window
+import _Blender.Window as _Window
 
 t = _Window.Types 
 Const = t # emulation