Key.c/h - Removed unneeded functions. and ipo in struct wasnt being used.

Lattice.c - removed warning
Mesh.c - (own error) when running me.update(key="...") didnt update the right keyframe.

mesh_cleanup.py - Bugfix from a report by plumiferos that started uncovering all the memory leaks.
Removing NAN verts didnt work with mesh keyframes.

source/blender/python/api2_2x/Key.h

@@ -50,7 +50,7 @@ typedef struct {
 	Key * key;			/* libdata must be second */
 	/* Object *object;*/		/* for vertex grouping info, since it's stored on the object */
 	/*PyObject *keyBlock;*/
-	PyObject *ipo;
+	/*PyObject *ipo;*/
 } BPy_Key;
 
 typedef struct {