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/NMesh.py

@@ -6,7 +6,7 @@
   most probably limited. Use the 'Mesh' module instead.
 """  
 
-#import _Blender.NMesh as _NMesh
+import _Blender.NMesh as _NMesh
 import shadow
 
 class Mesh(shadow.shadow):