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/Lattice.c

@@ -677,7 +677,7 @@ static PyObject *Lattice_getLatSize(BPy_Lattice * self)
 
 static PyObject *Lattice_getAxisType(BPy_Lattice * self, void * type)
 {
-	char interp_type = (char)NULL;
+	char interp_type = 0;
 	switch ( (int)type ) {
 	case 0:
 		interp_type = self->lattice->typeu;