fix 1588
release-note: add to ZK-1588
fix 1588
Merge branch 'B65-ZK-1588' of git://github.com/huangnoah/zk
fix less or eq to less
Merge branch 'B65-ZK-1588' of git://github.com/huangnoah/zk
Fix bug ZK-1645: Incorrect display in IE 7 for tree component if user zoom to greater than 100%
http://tracker.zkoss.org/browse/ZK-1645
Merge branch '6.0'