Changes:

- Bugfix: silly delete Bug
- Bugfix: Poll Button was visible even if selected disallow in the Forum settings
- Bugfix: " was missing in templates viewtopic_flat.html and viewtopic_thread.html
- Bugfix: read / unread
- Bugfix: search typo error
- Added: TinyMCE Editor support
- Added: Permission setting for the Subject Prefix
- Added: text filter for XSS vulnerability

从2.0或2.01升级方法：直接上传覆盖, 然后更新模块

从2.0以前版本：上传覆盖，运行相应的升级代码，然后更新模块