Based on user input that we never listen to:

* Move "save all edited" operator to layer tab
* Duplicate operator in image menu in image editor.

release/scripts/startup/bl_ui/space_image.py

@@ -176,6 +176,8 @@ class IMAGE_MT_image(Menu):
 
         layout.operator("image.read_renderlayers")
 
+        layout.operator("image.save_dirty", text="Save All Images")
+
         if ima:
             if not show_render:
                 layout.operator("image.replace")