P: Create a named version of a photo when export

When export a photo, create a new named version "Exported yyyy-mm-dd" of the photo.

This feature should be optional, may be as global option or swithable in the export screen.

This feature is requested as a restoration point, because it is easy to change unintentionally a photo after export it (pherhaps several days later), so you can not export the photo again with the same configuration.