[file_view] file share: bug fix
fixed tests
enable office preview for cluster
Add wmv preview support
Revert "[org] Update payment page"

This reverts commit 249a2addb5f5fb80be2320871c8c6c3b51fc5a84.
Removed file contributors, and use rpc to get file modifier and modification time
[auth] Add option to force org account register
[fileupload] small fix
[wiki] Use "Unknown" when there is no contributor
[useradmin] add "shared links" tab
[sysadmin] Refactor share links in user info page
[share link] added 'expiration' back
[repo_settings] added 'shared links' back
Add 2 email settings to share link sending
* REPLACE_FROM_EMAIL - replace email from field to username
* ADD_REPLY_TO_HEADER - add Reply-to header
[lib setting] improved ui of 'shared links'
[lib setting] improved code indention
[repo-setting] fix bug while checking download/upload links
[sys-admin] at user-info page, remove shared links if related
            dir/file has already been deleted
[sys-admin-traffic] add hyperlink to username
[fileupload] redesigned 'add folder'