fix patch from master -> stable migration

cosmogramme/sql/patch/patch_242.php

 <?php
-Zend_Registry::get('sql')->query('CREATE TABLE `album_item` ( '
+Zend_Registry::get('sql')->query('CREATE TABLE if not exists `album_item` ( '
 																 . 'id int(11) unsigned not null auto_increment,'
 																 . 'album_id int(11) unsigned not null,'
 																 . 'loan_count int(11) not null,'

cosmogramme/sql/patch/patch_243.php

 <?php
-Zend_Registry::get('sql')->query('CREATE TABLE `loan_pnb` ( '
+Zend_Registry::get('sql')->query('CREATE TABLE if not exists `loan_pnb` ( '
 																 . 'id int(11) unsigned not null auto_increment,'
 																 . 'record_origin_id varchar(50) not null,'
 																 . 'subscriber_id varchar(20) not null,'

cosmogramme/sql/patch/patch_245.php

 <?php
-Zend_Db_Table::getDefaultAdapter()
-	->query('alter table codif_thesaurus add column rules varchar(250)');
+$adapter = Zend_Db_Table::getDefaultAdapter();
+
+try {
+	$adapter->query('select rules from codif_thesaurus');
+}	catch (Exception $e) {
+	$adapter->query('alter table codif_thesaurus add column rules varchar(250)');
+}
 ?>
\ No newline at end of file

cosmogramme/sql/patch/patch_257.php

 <?php
 $adapter = Zend_Registry::get('sql');
-$adapter->query('ALTER TABLE reservations ADD COLUMN rang tinyint');
+try {
+	$adpater->query('select rang from reservations limit 1');
+} catch (Exception $e) {
+	$adapter->query('ALTER TABLE reservations ADD COLUMN rang tinyint');
+}
 $adapter->query('ALTER TABLE reservations modify  date_resa datetime default null');
 ?>
\ No newline at end of file