wip(ldap): grants can be ordered by this field

issue #922

sql/mysql/access_ldap_attribute.sql

@@ -5,7 +5,7 @@ CREATE TABLE `access_ldap_attribute` (
   `value` varchar(64),
   `allowed` int not null default 1,
   `n_order` int not null default 1,
-  `last` int not null default 1,
-  PRIMARY KEY (`id`)
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `id_base` (`id_domain`,`attribute`,`value`)
 );
 

sql/sqlite/access_ldap_attribute.sql

@@ -4,5 +4,6 @@ CREATE TABLE `access_ldap_attribute` (
 ,  `attribute` varchar(64)
 ,  `value` varchar(64)
 ,  `allowed` integer not null default 1
+,  `n_order` integer not null default 1
 ,  UNIQUE (`id_domain`,`attribute`,`value`)
 );