added list2MeshWeight and meshWeight2List - faster then the dict equivilents and better in some cases.

Speedup for bpymesh_redux (poly reducer) with reducing vertex weights. use list2MeshWeight and meshWeight2List.

renamed vertex gradient files

Removed reload()'s
- 3ds_import.py
- mesh_cleanup.py
- mesh_poly_reduce.py
- vertexpaint_selfshadow_ao.py

release/scripts/3ds_import.py

@@ -109,7 +109,6 @@ import Blender
 from Blender import Mesh, Scene, Object, Material, Image, Texture, Lamp, Mathutils
 from Blender.Mathutils import Vector
 import BPyImage
-reload( BPyImage )
 
 import struct
 from struct import calcsize, unpack