Improved support for enchantgrade (#5975)

Added further support for enchantgrade so that the enchantgrade is not lost during certain processes and can be accessed via script commands.
Also added missing logging support for it.

sql-files/logs.sql

@@ -197,6 +197,7 @@ CREATE TABLE IF NOT EXISTS `picklog` (
   `unique_id` bigint(20) unsigned NOT NULL default '0',
   `map` varchar(11) NOT NULL default '',
   `bound` tinyint(1) unsigned NOT NULL default '0',
+  `enchantgrade` tinyint unsigned NOT NULL default '0',
   PRIMARY KEY  (`id`),
   INDEX (`type`)
 ) ENGINE=MyISAM AUTO_INCREMENT=1;