Node Clone during Save

Display of example "Save and Clone" button.

This is a clone of the sandbox project by covenantd at https://drupal.org/sandbox/covenantd/1866074. The sandbox hasn't been updated in 45 weeks and the maintainer seems to think that patching node_clone is imminent, however the referenced ticket (: Patch or standalone module for Node Clone on Save button) doesn't seem to be going anywhere.