add backend_footer event hook

docs/NEWS

@@ -3,6 +3,8 @@
 Version 1.7.4 ()
 ------------------------------------------------------------------------
 
+    * Added "backend_footer" event hook
+    
     * Fixed pagination when searching terms with fetchlimit < 4
 
     * Fixed deprecated /e modifier with PHP >= 5.5 in nl2br plugin restore method

templates/default/admin/index.tpl

@@ -247,6 +247,11 @@
             <span>{$admin_vars.version_info}</span>
         </div>                            
         {/if}
+
+        {if $admin_vars.admin_installed}
+            {serendipity_hookPlugin hook="backend_footer" hookAll="true"}
+        {/if}
+
     </body>
 <!-- ADMIN-ENTRY TEMPLATE: index.tpl END -->
 </html>