Fix bug ZK-1526: layouts and containers should not take menupopup into account when computing padding
http://tracker.zkoss.org/browse/ZK-1526
F65-ZK-1616: AU response error can be handle by user
B65-ZK-1617: Panel in Portallayout not draggable after updated
Fix vlayout flex calculation
B65-ZK-1612: Drag drop on IE9, does not work right with an Image
Merge remote-tracking branch 'VincentJian/flex'
fine tune