Shortcodes: restrict and /re strict

The Restrict Content plugin enables the use of the restrict and /restrict shortcodes.  (in real use, put [ ] brackets around each shortcode.)  Any text inserted between those shortcodes is displayed only if the user is logged-in.

These shortcodes may be used in any post or page.  In particular, they are often used in conjunction with the fusn-login shortcode, described in another IT Note.