Torf

- Fixed minor bug that caused trailing zeros to be removed from numbers, e.g.
"10 GiB" was displayed as "1 GiB"

- Use proper version number scheme.
- Fixed "--exclude requires PATH" error when editing a torrent with global
"exclude" options in the config file.
- New options: --source to add a "source" field to the torrent and --nosource
to remove it from an existing torrent.
- New option: --max-piece-size optionally limits the piece size.

- Keep piece size smaller for large torrents and use more pieces to
compensate.
- Implement your own piece size calculation of arbitrary complexity by simply
overloading Torrent.calculate_piece_size().

- Support for default arguments and special profiles in ~/.config/torf/config
or any file specified by --config or -f.
- Use \e[0E instead of \e[1` to clear the line when showing progress.
(marcelpaulo)
- If output is not a TTY, "Progress ..." lines are not cleared but followed by
a newline character and the rest of the line is parsable like the other
output.
- Long or multiline torrent file comments are now properly indented.
- --exclude patterns are now matched against each directory/file name in a
path instead of just the file name.
- Torrent file and magnet link are now both created by default, and the
--magnet option was replaced by --nomagnet and --notorrent.
- In the output 'Magnet URI' was shortened to 'Magnet', 'Torrent File' was
shortened to 'Torrent' and 'Creation Date' was shortened to 'Created'.
- The default for --date was changed from 'today' to 'now'.

- Use proper version number scheme
- Raise PieceSizeError if 'piece_size' is set to a number that isn't a power
of two

- New methods read_stream() and write_stream() to import/export a torrent from
any file-like object