Feature ZK-1991: AMedia FileDownload support ignore add Content-Disposition to header
http://tracker.zkoss.org/browse/ZK-1991
use AtomicBoolean to prevent serialization deadlock, if any.
Merge branch 'master' of github.com:zkoss/zk
Merge remote-tracking branch 'VincentJian/F70-ZK-1991'
deprecated Session's getRemoteHost(), getRemoteAddr(), getServerName(), getLocalName(), and getLocalAddr() methods, please use these methods from Executions.getCurrent() instead.
Bug ZK-1565: Dragging listitem to itself will result in the listbox being set as the target
fix F70-ZK-1818.zul
Fix bug ZK-1998: Listbox using GroupsModel sometimes would not update the select all status
http://tracker.zkoss.org/browse/ZK-1998
fine tune LESS variables
Feature added ZK-1974: Tabbox support take maximal size of all children tabpanels
http://tracker.zkoss.org/browse/ZK-1974
minor fix
Merge branch 'F70-ZK-1974' of git://github.com/huangnoah/zk