* 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