minor fine tune
update Frozen component
change border-box to affect for ZK component only
Merge branch '7.0' of github.com:zkoss/zk into 7.0
fix an issue of zk().isOverlapped() function to use revisedOffset instead of cmOffset for body's scroll issue
fix splitter collapse with none styling issue
add zk().marginWidth() and marginHeight() function
refine checkbox, radio less and separator
refactoring flex.js for v/hflex with number
Merge branch '7.0' of github.com:zkoss/zk into 7.0
1. merge FixMinVflex and FixMinHflex into one function
2. fix bandpopup's flex with min issue
fine tune window, panel, and tabpanel
fine tune v/hflex with min
bug fixed for v/hflex issue
fix v/hflex issue