Introduce the -devel version of the 2.3.x branch at rc10.
It has the following new features relative to the 2.2.x branch:
* Simplified torrent root folder renaming/truncating
(< v2.3.0 is no longer forward compatible)
* Remember previous save paths in torrent addition dialog
* Max number of half-open connections can now be edited
* Added support for strict super seeding
* The user can force listening on a particular network interface
* Added cookie support for RSS feeds
* User can force tracker reannounce
* Added "No action" setting for double-click action
* Several torrents can be moved at once
* Added error state for torrents (error is displayed in a tooltip)
* Added filter for paused/error torrents
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