Update to Transmission-1.50.

All Platforms
* IPv6 support for peers, and for trackers with explicit IPv6 addresses
* Improved connectivity for encrypted peers
* Fix 1.42 error that made tracker announces slower over time
* Fix a Mac-centric peer connection bug from 1.41
* Use less CPU cycles when managing very fast peers
* Better handling of non-UTF-8 torrent files
* When removing local data, only remove data from the torrent
* Close potential DoS vulnerability in 1.41
* Many other bugfixes
GTK+
* Various usability improvements
* Better Gnome HIG compliance in the statusbar, properties dialog, and more
Daemon
* Lots of new options added to transmission-remote
* Fix 1.42 whitelist bug
* Make i18n support optional for cli and daemon clients
CLI
* Support session.json settings, just as the Daemon and GTK+ clients do
Web Interface
* Torrents can now be added by URL
* Add the ability to "remove local data" from the web client

(tnn)