Sculpt Branch:

* Don't allow adding/removing multires levels in editmode.
* Customdata code for swapping mdisps restored.
* Fix inflate brush crashing with multires.
* Smooth and layer brush don't work yet with multires, but at
  least avoids crashing now.
* Fix threading issue with flatten brush.

release/scripts/ui/properties_data_modifier.py

@@ -440,6 +440,7 @@ class DATA_PT_modifiers(DataButtonsPanel):
         if wide_ui:
             col = split.column()
 
+        col.enabled = ob.mode != 'EDIT'
         col.operator("object.multires_subdivide", text="Subdivide")
         col.operator("object.multires_higher_levels_delete", text="Delete Higher")
         row = col.row()