Changes in FlashGet version 1.81.1002 (2007.01.30)

* Enable to increase/decrease threads when disabling mirrors download
* Optimize download flow and 99% download problem
* fix - program is likely to lose response or crash when downloading multi-files
* fix - graph/log window can not be refreshed after resuming broken download
* fix - Show 99% problem in dropzone after downloaded
* fix - Disk read/write errors in some situation