[Bf-python] Making Vectors consistant.

[Campbell J Barton]

Hi all
I have been dealing with different types of mesh data and it gets 
frusterating how some types are treates as normals and some arnt.

Eg- f.v.co is a mathutils Vector
and face.normal is a plane list.

Just to let you know, theres also a bug.

You can do a

for Vert in mesh.verts:
  Vert.co.resize4D()
  Vert.co.w = 0

At 1 point I was able to segfault Blender by resizing NMesh data that is 
accsessed as vectors but only supposed to be a fixed length.
There should probably be some locking function in the Vector() class 
where vectors can be set -unresizeable.
If this is tried it should raise an exception.

UV coords, Vertex colours, Faces.normal and location could all be 
vectors- .... mabe not colours- but all the rest could/should be.

- Cam

-- 
Campbell J Barton

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