* Add HTTP POST support
* Add expires handling for Cookie
* Add SSL server cert verification
* Add SSL client cert support
* Better HTTP status handling
* Download files listed in a specifed file.
* check MD5 checksum
* Add the feature which adds or removes URLs on-the-fly.
* Tracker UDP protocol
* no-compact peers format
* Add port range command-line option
* Add max peers command-line option
* Distinguish seeder from leecher
* file selection in multi-file mode
* try to use ftruncate to allocate file.