feature 2541 multisize

- core implementation + usage on most public/admin pages
- still to do: sync process, upload, gui/persistence for size parameters, migration script, center of interest ...

git-svn-id: http://piwigo.org/svn/trunk@12796 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions_notification.inc.php

@@ -458,7 +458,7 @@ SELECT date_available,
     if ($max_elements>0)
     { // get some thumbnails ...
       $query = '
-SELECT DISTINCT id, path, name, tn_ext, file
+SELECT DISTINCT id, path, name, representative_ext, file
   FROM '.IMAGES_TABLE.' i INNER JOIN '.IMAGE_CATEGORY_TABLE.' AS ic ON id=image_id
   '.$where_sql.'
     AND date_available=\''.$dates[$i]['date_available'].'\'
@@ -535,7 +535,7 @@ function get_html_description_recent_post_date($date_detail)
 
   foreach($date_detail['elements'] as $element)
   {
-    $tn_src = get_thumbnail_url($element);
+    $tn_src = DerivativeImage::thumb_url($element);
     $description .= '<a href="'.
                     make_picture_url(array(
                         'image_id' => $element['id'],