Refactor for The 12th UESTC Programming Contest 

1. Add inherit type editor support.
2. Show teams in rank list when contest type is INVITED.
3. Disable rank list auto refresh
4. Redirect to browser download page when user use IE 6, IE 7 or IE 8.
5. Use absolute path in BBS link
6. Sort data files by name when upload problem data.
7. Show team members submit status in status list.
8. Disable submit function when contest ended.