URL rewriting: capable of fully working with urls without ?

URL rewriting: works with image file instead of image id (change
make_picture_url to generate urls with file name instead of image id)

URL rewriting: completely works with category/best_rated and
picture/best_rated/534 (change 'category.php?' to 'category' in make_index_url
and 'picture.php?' to 'picture' in make_picture_url to see it)

fix: picture category display in upper bar

fix: function rate_picture variables and use of the new user type

fix: caddie icon appears now on category page

fix: admin element_set sql query was using storage_category_id column
(column has moved to #image_categories)

fix: replaced some old $_GET[xxx] with $page[xxx]

fix: pictures have metadata url (use ? parameter - might change later)

git-svn-id: http://piwigo.org/svn/trunk@1092 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions_category.inc.php

@@ -47,9 +47,9 @@ function check_restrictions($category_id)
   if (in_array($category_id, explode(',', $user['forbidden_categories'])))
   {
     $login_url =
-      './identification.php?redirect='
+      get_root_url().'identification.php?redirect='
       .urlencode(urlencode($_SERVER['REQUEST_URI']));
-    
+
     if (!$user['is_the_guest'])
     {
       die('Fatal: you are trying to reach a forbidden category');
@@ -278,7 +278,7 @@ function display_select_categories($categories,
     if ($fullname)
     {
       $option = get_cat_display_name_cache($category['uppercats'],
-                                           '',
+                                           null,
                                            false);
     }
     else