BitComet 0.69

- GUI Improved: download status infomation will be displayed in preview window info bar when preview is buffering
- GUI Improved: BitComet Forum URL is updated
- GUI Bugfix: controls in Task Properity Dialog will reposition correctly when resizing the dialog
-GUI Bugfix: fix the bug that the spin buttons of min/max upload rate edit-box in Task Properity Dialog do not work
- GUI Bugfix: fix the bug that the peer list doesn't display any peer in very occasional situation
- GUI Bugfix: be able to handle BCTP link opened from FireFox properly
- Core Improved: improve preview buffer schedule algorithm, start buffer if data in buffer pool less than 50%, resume play if full
- Core Improved: improve piece request algorithm when preview, decrease the chance of buffering
- Core Improved: improve error detection of video decoder when start preview
- Core Bugfix: fix the bug that the video and audio sometimes become asynchronous caused by preview buffering
- Core Bugfix: fix the bug that the program may crash when parsing some non-standard HTTP protocol packet