feature 169 added: ability to manually sort images inside a category. A

dedicated screen let the administrator sort the images (pur HTML, no
JavaScript yet). The "rank" sort order is available only for a category
without flat mode. New database column image_category.rank.


git-svn-id: http://piwigo.org/svn/trunk@2517 68402e56-0260-453c-a942-63ccdbb3a9ee

install/piwigo_structure.sql

@@ -150,6 +150,7 @@ DROP TABLE IF EXISTS `piwigo_image_category`;
 CREATE TABLE `piwigo_image_category` (
   `image_id` mediumint(8) unsigned NOT NULL default '0',
   `category_id` smallint(5) unsigned NOT NULL default '0',
+  `rank` mediumint(8) unsigned default NULL,
   PRIMARY KEY  (`image_id`,`category_id`),
   KEY `image_category_i1` (`category_id`)
 ) TYPE=MyISAM;