And also add default value to encoding parameter, if
none was specified.

Closes: #784891

Comparing two uncompressed .info files directly is working with the
text comparator. But it is crashing when it is compressed with gzip (#784891).

I tried adding a new comparator for .info files which uses the info
utility to dump the whole info manual, but this was also adding
the temporary filename (where dbd extracted the file to) into
the output (and therefore always causing differences).
Trying to pipe the content to info and let it read from /dev/stdin
was also not successful yet.

I'm reverting this back to the old behavior until a proper solution
has been found.

This allows debbindiff to process drmips.

It should be a lot faster. Because it's a new required tool,
we must shuffle couple things around.

While using debbindiff with file system images mounted with different
loop devices, stat shows that those loop devices are indeed
different. This clutters the report if you are comparing many files and
unable to see important points.

Usually those devices does not matter when comparing files for
reproducible build, so disable the device diff.

But to get them all we would need to parse `file` output in text mode.
Let's see later.

Closes: #782551

Closes: #782253

Zip member filenames may contain "../", which
is ignored while extracting. ZipFile.extract returns
the actual path where the file is extracted to.