Instead of checking if `options.quiet` is set whenever printing, disable
all printing to stderr if the `--quiet` flag is passed.
Although it isn't strictly necessary, I still don't construct a progress
bar if `options.quiet` is true, since progress bars might be a little
more expensive than just printing error messages.
A future diff might add checking to the `errln` and `outln` macros, so
that they don't print at all if the respective output stream is
inactive.
type: reform
Torrents may now be created from standard input by passing `--input -`.
Since `--name` and `--output` cannot be deduced, they are required when
`--input -`.
type: added
Adds the command `imdl` torrent verify` to verify the contents of torrents.
This implementation is extremely naive. It does successfully verify torrents,
but it will produce unsatisfying results when a torrent fails verification. In
particular, it won't give any information about which pieces in a file were
corrupt.
type: added
