Bug fixed B65-ZK-1737: Typo in some zk.fmt.Number functions: varStr
(wrong) vs valStr (right)  http://tracker.zkoss.org/browse/ZK-1737
Merge branch 'B65-ZK-1737' of git://github.com/huangnoah/zk
Fix side effect of bug ZK-1718
Fix Bug B65-ZK-1705: NullPointerException when sorting a list model bound to a Listbox without a Listhead component
Fix Bug B65-ZK-1704: NullPointerException when sorting a list model bound to a Grid without a Columns component
Merge branch 'B65-ZK-1705' of git://github.com/cor3000/zk