define configuration settings for account maintenance security

README

@@ -1276,6 +1276,12 @@ Profile management.
 
 biolimit: max character length of bio; 0 means no limit; null means to use
     the site text limit default.
+backup: whether users can backup their own profiles. Defaults to true.
+restore: whether users can restore their profiles from backup files. Defaults
+	 to true.
+delete: whether users can delete their own accounts. Defaults to true.
+move: whether users can move their accounts to another server. Defaults
+      to true.	 
 
 newuser
 -------

lib/default.php

@@ -123,7 +123,11 @@ $default =
               'featured' => array()),
         'profile' =>
         array('banned' => array(),
-              'biolimit' => null),
+              'biolimit' => null,
+              'backup' => true,
+              'restore' => true,
+              'delete' => true,
+              'move' => true),
         'avatar' =>
         array('server' => null,
               'dir' => INSTALLDIR . '/avatar/',