qbittorrent end of torrent priority

qbittorrent package patched with patch by John Supplee

"""
RATIONALE: Some video files store information at the end
of the file which is needed in order to play the file. So
to play the file before it is finished downloading the
last bit of the file is needed.

IMPLEMENTATION: Allow the user to specify how large of a
block at the end of the torrent to download in advanced
settings (1-16 MB, default 2MB). If the user chooses to
download the first and last blocks of a torrent, set a
higher priority on enough blocks at the end of the torrent
to match the value specified in Advanced Settings.

POSSIBLE PROBLEMS: Changing the desired block size in advanced
settings may not update settings for active torrents.
"""