Bug fixed, B65-ZK-1588: bandbox popup should drop up when the space
between the bandbox and the bottom of browser is not enough
http://tracker.zkoss.org/browse/ZK-1588
minor fix
Merge branch 'master' of github.com:zkoss/zk
fix ZK-1863: validationMessages with init annotation throw exception
Bug - ZK-1864: share listmodelist cause un-predictable reload
Merge branch 'master' of github.com:zkoss/zk
Bug ZK-1861: Js error when flex + visible = false
Bug ZK-1867: Set visible of row doesn't work correctly
Bug ZK-1868: TypeError: $tipOff is null in function _tt_close()
Merge remote-tracking branch 'upstream/master' into 7.0