bmesh py api:

added access to deform weights, access to weights acts like a python dict so you can do...

  print(group in dvert)
  dvert[group] = 0.5
  print(dvert[group])
  del dvert[group]
  print(dvert.items())

doc/python_api/sphinx_doc_gen.py

@@ -342,7 +342,8 @@ MODULE_GROUPING = {
                     "BMLayerCollection",
                     "BMLayerItem",
                     ("Custom-Data Layer Types", '-'),
-                    "BMLoopUV"
+                    "BMLoopUV",
+                    "BMDeformVert"
                     )
     }