issue #1953 improved privacy on searches and associate each search to its creator

* remove temporary functions ws_gallery_getSearch and ws_gallery_updateSearch
* split get_search_array into sub-functions to use them in web API
* use search_uuid as search_id instead of the numeric search.id : better privacy
* only the creator of the search can update it
* if a visitors tries to open the search of another user, it (the search) gets forked into a new search

install/db/166-database.php

@@ -0,0 +1,26 @@
+<?php
+// +-----------------------------------------------------------------------+
+// | This file is part of Piwigo.                                          |
+// |                                                                       |
+// | For copyright and license information, please view the COPYING.txt    |
+// | file that was distributed with this source code.                      |
+// +-----------------------------------------------------------------------+
+
+if (!defined('PHPWG_ROOT_PATH'))
+{
+  die('Hacking attempt!');
+}
+
+$upgrade_description = 'Create new columns for search (search_uuid, created_on, user_idx, forked_from).';
+
+pwg_query('
+ALTER TABLE `'.PREFIX_TABLE.'search`
+  ADD COLUMN `search_uuid` CHAR(23) DEFAULT NULL,
+  ADD COLUMN `created_on` DATETIME DEFAULT NULL,
+  ADD COLUMN `created_by` MEDIUMINT(8) UNSIGNED, 
+  ADD COLUMN `forked_from` INT(10) UNSIGNED
+;');
+
+echo "\n".$upgrade_description."\n";
+
+?>