rna/py api

rename image.save() --> image.save_render() because it uses render settings for saving.
added image.save() which is like pressing save in the image view, saving to the images path and removing the dirty flag.

release/scripts/op/image.py

@@ -38,7 +38,7 @@ class SaveDirty(bpy.types.Operator):
                     self.report({'WARNING'}, "Path used by more then one image: " + path)
                 else:
                     unique_paths.add(path)
-                    image.save(path=path)
+                    image.save()
         return {'FINISHED'}