Generate a reference for every document page and display it in page Information section

The Include macro (http://extensions.xwiki.org/xwiki/bin/view/Extension/Include+Macro) is a default macro in XWiki Enterprise installation, so it is probably widely used. Its purpose is to allow users to include/embed a page into another page. A mandatory parameter for this macro is a `reference` to the page to be included. The problem is, this reference is hard to correctly create manually. While it'd be ideal if the macro provide a GUI interface so users can easily search for and select the page they want included, it would take considerable development effort to add that GUI to the macro. So in the mean time maybe it's more practical to just display that reference on every page's Information section, so user can copy and paste it into the Include macro's configuration section.