Added another incremental from merge request

Author: Marius Cramer

install/sql/incremental/upd_0073.sql

@@ -1,3 +1,4 @@
 ALTER TABLE `client_template` ADD `limit_backup` ENUM( 'n', 'y' ) NOT NULL DEFAULT 'y' AFTER `limit_webdav_user`;
 ALTER TABLE `client` ADD `limit_backup` ENUM( 'n', 'y' ) NOT NULL DEFAULT 'y' AFTER `limit_webdav_user`;
 ALTER TABLE  `web_domain` CHANGE  `php_fpm_use_socket`  `php_fpm_use_socket` ENUM(  'n',  'y' ) NOT NULL DEFAULT  'y';
+ALTER TABLE `mail_domain` ADD `dkim_selector` VARCHAR(63) NOT NULL DEFAULT 'default' AFTER `dkim`;

install/sql/ispconfig3.sql

@@ -742,6 +742,7 @@ CREATE TABLE `mail_domain` (
   `server_id` int(11) unsigned NOT NULL default '0',
   `domain` varchar(255) NOT NULL default '',
   `dkim` ENUM( 'n', 'y' ) NOT NULL default 'n',
+  `dkim_selector` varchar(63) NOT NULL DEFAULT 'default',
   `dkim_private` mediumtext NULL,
   `dkim_public` mediumtext NULL,
   `active` enum('n','y') NOT NULL,