Add forked Maatkit tools in bin/ and their tests in t/.

t/pt-duplicate-key-checker/samples/issue_663.sql

@@ -0,0 +1,12 @@
+DROP DATABASE IF EXISTS issue_663;
+CREATE DATABASE issue_663;
+USE issue_663;
+CREATE TABLE `t` (
+  `id` int(10) unsigned NOT NULL auto_increment,
+  `trx_id` int(10) unsigned default NULL,
+  `dTime` datetime NOT NULL,
+  `xmlerror` text,
+  PRIMARY KEY (`id`),
+  KEY `idx1` (`trx_id`),
+  KEY `idx2` (`trx_id`, `xmlerror`(128), `dTime`)
+) ENGINE=MyISAM;