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/Lamp.py

@@ -11,7 +11,7 @@ Example::
   ob.link(l)
 """
 
-#import _Blender.Lamp as _Lamp
+import _Blender.Lamp as _Lamp
 import shadow
 
 _validBufferSizes = [512, 768, 1024, 1536, 2560]