Libtc

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* Added: Label support for qbittorrent

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* Change: rtorrent shares more information about failures to add torrents

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* Bugfix: symlinks should not be resolved

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* Bugfix: Pypi broke

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* Added: Test matrix for multiple ubuntu releases

* Change: Bumped and unbounded version of some requirements

* Bugfix: Changed how qbittorrent handles subfolders
* Bugfix: Transmission 3 torrent location
* Bugfix: Fixed qbittorrent torrent file retrival problem in newer versions

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* Added: Label support to rtorrent and deluge