Removed getState() and concat() methods from mysql driver, getState() is not...

Removed getState() and concat() methods from mysql driver, getState() is not needed (it resides at transaction class) and concat is located at mysql expression driver

lib/Doctrine/Connection/Firebird.php

@@ -85,7 +85,7 @@ class Doctrine_Connection_Firebird extends Doctrine_Connection {
      *                  'rw'   => 'READ WRITE' | 'READ ONLY'
      * @return void
      */
-    function setTransactionIsolation($isolation, $options = array()) {
+    public function setTransactionIsolation($isolation, $options = array()) {
         switch ($isolation) {
             case 'READ UNCOMMITTED':
                 $ibase_isolation = 'READ COMMITTED RECORD_VERSION';

lib/Doctrine/Connection/Mysql.php

@@ -111,26 +111,4 @@ class Doctrine_Connection_Mysql extends Doctrine_Connection_Common {
         $query = "SET SESSION TRANSACTION ISOLATION LEVEL $isolation";
         return $this->dbh->query($query);
     }
-    /**
-     * Returns string to concatenate two or more string parameters
-     *
-     * @param string $value1
-     * @param string $value2
-     * @param string $values...
-     * @return string               a concatenation of two or more strings
-     */
-    public function concat($value1, $value2) {
-        $args = func_get_args();
-        return "CONCAT(".implode(', ', $args).")";
-    }
-    /**
-     * returns the state of this connection
-     *
-     * @see Doctrine_Connection_Transaction::STATE_* constants
-     * @return integer          the connection state
-     */
-    public function getState() {
-        return 0; // @todo FIXME not working!
-    }
 }
-