Fix compile warnings
add release date
release 6.5.5
B70-ZK-2068: In Portallayout, width property set via a controller is reset to the value at page load on browser window resize http://tracker.zkoss.org/browse/ZK-2068
update version to 6.5.6-FL
Bug fixed B70-ZK-2081: Can not customize the text of the tooltip when scrolling the slider
http://tracker.zkoss.org/browse/ZK-2081
Merge remote-tracking branch 'upstream/6.5'
Merge remote-tracking branch 'RaymondChao/B70-ZK-2081'
Bug fixed B70-ZK-2070: grid onScroll client-side event not working in 7.0 http://tracker.zkoss.org/browse/ZK-2070
Bug fixed B70-ZK-2072: template composition not working as described
http://tracker.zkoss.org/browse/ZK-2072
Bug fixed B70-ZK-2070: grid onScroll client-side event not working in 7.0 http://tracker.zkoss.org/browse/ZK-2070