update to the md2 importer.

* moved from NMesh to Mesh
* made newstyle classes (use less memory)
* optimized mesh creation
* Animation now imports and plays (Bugfix for 5834)
+ other small tweaks

Added mesh.key - was missing from docs

source/blender/python/api2_2x/doc/Mesh.py

@@ -778,6 +778,8 @@ class Mesh:
   @ivar texMesh: The mesh's texMesh setting, used so coordinates from another
     mesh can be used for rendering textures.
   @type texMesh: Mesh or None
+  @ivar key: The L{Key<Key.Key>} object containing the keyframes for this mesh, if any.
+  @type key: Key or None
 
   @ivar activeUVLayer: The mesh's active UV/Image layer. None if there is no UV/Image layers.
   @type activeUVLayer: string