Added index to user starred files
[file-edit] add filename as website title at file edit page
fixed excel file preview in shared links
update link of Contact-Us
Modify footer
Fix typo in personal wiki creation
[priv shared file view] 'save popup': sort libs, modified ui of buttons
[notice-popup] add simple group discussion topic to grpmsg-reply notification
[notice] add 'topic' to grp-msg-reply: improved code & ui
[notice] msg reply: improved ui & truncation of msg
[repo] refactor multi-dirents mv/cp, improved file/dir mv/cp

* when mv/cp multi-dirents to other library, mv/cp dirent one by one
[repo] modified mv/cp
[performance] combined 'file upload' js files and use ajax to load some js files
Add permission check in pdf fullscreen
Add a few perm check
Remove deprecated code
Fix org paginator and permission
Merge branch '3.1'