Bug #29, Add "duplicate-post" WP plugin/submodule [JuxtaLearn]

* Version 2.6 (miss labelled 2.3.1?)
* http://wordpress.org/plugins/duplicate-post/
* https://github.com/wp-plugins/duplicate-post/commit/c0696bfb636459ba
* git-svn-id: https://plugins.svn.wordpress.org/duplicate-post/trunk@863551
* @lopo authored on Feb 23 "Checkboxes with list .."