aria2/TODO

* 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.
* Add the feature which adds or removes URLs on-the-fly.
* Add port range command-line option
* Add max peers command-line option
* Refacturing HttpConnection and FtpConnection
* Query resource by location
* List available os, version, etc for metalink
* ipv6(RFC2428 for ftp)
* Add silent mode.
* Save URLs and command-line arguments to .aria2 file.
* Add a control port for GUI frontend
* Add a version header to .aria2 file to check the compatibiliy.
* Use SharedHandle where it is useful.
* Rewrite Util::countBit
* Add --bt-timeout command line option.
* Fix DefaultBtProgressInfoFile.cc: save(), load()
* remove blockIndex
* Add seed mode.

* Rewrite ByteArrayDiskWriter, TrackerUpdateCommand with stringstream
* Make trakcerwatchercommand and trackerUploadCommand poses requestGroup 
* consider life cycle of requestGroup and segmentMan


* Add fancy console read out. like this:
100K/300M(10%)(3cn)(3more) 100KB/s [FileAlloc:35MB/40MB(90%)][Checksum:10MB/20MB(50%)]
* exit status: all downloads have been successful-> EXIT_SUCCESS,
		some of downloads have been failed -> EXIT_FAILURE
* use hintFilename and hintTotalLength if these are provided.
	-> test against ftp downloads
* make sure that the same file name is not used at the same time.
* Do not use ufilename in multi-simultaneous download mode.
* Replace numCommandToGenerate to the value of PREF_METALINK_SERVERS
* Do not send range header if the position of starting byte is 0 and
the position of ending byte is not specified.
* Create download command directly when 1connection download.
Consider timeout when file allocation/check integrity is enabled.
* Test DefaultPeerStorage