switched to mysqli_select_db

the emulation of mysql_select_db with the USE statement did not quote the table name so table names which need quotation (which contain dashes for example) were not handled correctly
the emualtion is not needed, see https://github.com/philip/MySQLConverterTool/issues/20

inc/functions_sql.php

@@ -226,7 +226,7 @@ function DB_Copy($source, $destination, $drop_source=0, $insert_data=1)
             return false;
         }
 	}
-    ((bool)mysqli_query($GLOBALS["___mysqli_ston"], "USE " . $destination));
+    mysqli_select_db($GLOBALS["___mysqli_ston"], $destination);
     $res=MSD_DoSQL($SQL_Array);
     if ($drop_source == 1 && $res) MSD_query("DROP DATABASE `$source`;");
     return $res;