adjust some style
adjust icon when panel is close
adjust vertical mold, tab:disable and rm lite mold style
Merge branch '7.0' of https://github.com/zkoss/zk into update-tabbox
adjust less tree, selected tab box-shadow, fixHgh() when tab set hgh
Add navigation test
Merge branch '7.0' of https://github.com/zkoss/zk into feature-nav
Merge branch '7.0' of https://github.com/zkoss/zk into update-tabbox

Conflicts:
	zul/src/archive/web/js/zul/tab/less/tabbox.less
[dom] adjust tabpanel dom tree in accordion mold
[less] adjust less tree and order
fine tune LESS variables
fine tune tree style
[less] adjust groupbox and caption style
fix LESS mixins
Merge branch 'update-tabbox' of git://github.com/huangnoah/zk into 7.0
Merge branch 'update-groupbox' of git://github.com/huangnoah/zk into 7.0
Merge branch 'update-panel' of git://github.com/huangnoah/zk into 7.0