Libtorrent

* allow NULL to be passed to create_torrent::set_comment and create_torrent::set_creator
* fix UPnP issue for routers with multiple PPPoE connections
* fix issue where event=stopped announces wouldn't be sent when closing session
* fix possible hang in file::readv() on windows
* fix CPU busy loop issue in tracker announce logic
* honor IOV_MAX when using writev and readv
* don't post 'operation aborted' UDP errors when changing listen port
* fix tracker retry logic, where in some configurations the next tier would not be tried
* fixed bug in http seeding logic (introduced in 0.15.7)
* add support for dont-have extension message
* fix for set_piece_deadline
* add reset_piece_deadline function
* fix merkle tree torrent assert

* exposed set_peer_id to python binding
* improve support for merkle tree torrent creation
* exposed comparison operators on torrent_handle to python
* exposed alert error_codes to python
* fixed bug in announce_entry::next_announce_in and min_announce_in
* fixed sign issue in set_alert_mask signature
* fixed unaligned disk access for unbuffered I/O in windows
* support torrents whose name is empty
* fixed connection limit to take web seeds into account as well
* fixed bug when receiving a have message before having the metadata
* fixed python bindings build with disabled DHT support
* fixed BSD file allocation issue
* fixed bug in session::delete_files option to remove_torrent

* fixed crash in udp trackers when using SOCKS5 proxy
* fixed reconnect delay when leaving upload only mode
* fixed default values being set incorrectly in add_torrent_params through add_magnet_uri in python bindings
* implemented unaligned write (for unbuffered I/O)
* fixed broadcast_lsd option
* fixed udp-socket race condition when using a proxy
* end-game mode optimizations
* fixed bug in udp_socket causing it to issue two simultaneous async. read operations
* fixed mingw build
* fixed minor bug in metadata block requester (for magnet links)
* fixed race condition in iconv string converter
* fixed error handling in torrent_info constructor
* fixed bug in torrent_info::remap_files
* fix python binding for wait_for_alert
* only apply privileged port filter to DHT-only peers

* support DHT extension to report external IPs
* fixed rare crash in http_connection's error handling
* avoid connecting to peers listening on ports < 1024
* optimized piece picking to not cause busy loops in some end-game modes
* fixed python bindings for tcp::endpoint
* fixed edge case of pad file support
* limit number of torrents tracked by DHT
* fixed bug when allow_multiple_connections_per_ip was enabled
* potential WOW64 fix for unbuffered I/O (windows)
* expose set_alert_queue_size_limit to python binding
* support dht nodes in magnet links
* support 100 Continue HTTP responses
* changed default choker behavior to use 8 unchoke slots (instead of being rate based)
* fixed error reporting issue in disk I/O thread
* fixed file allocation issues on linux
* fixed filename encoding and decoding issue on platforms using iconv
* reports redundant downloads to tracker, fixed downloaded calculation to
be more stable when not including redundant. Improved redundant data accounting
to be more accurate
* fixed bugs in http seed connection and added unit test for it
* fixed error reporting when fallocate fails
* deprecate support for separate proxies for separate kinds of connections

* fixed piece picker issue triggered by hash failure and timed out requests to the piece
* fixed optimistic unchoke issue when setting per torrent unchoke limits
* fixed UPnP shutdown issue
* fixed UPnP DeletePortmapping issue
* fixed NAT-PMP issue when adding the same mapping multiple times
* no peers from tracker when stopping is no longer an error
* improved web seed retry behavior
* fixed announce issue

* fixed announce bug where event=completed would not be sent if it violated the
min-announce of the tracker
* fixed limitation in rate limiter
* fixed build error with boost 1.44