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Closes #60

Note: this changeset also ensures that clean.cleaned.docx is removed
up after the pytest is over.

while mat2 has both a thread model (a thread pool that strips metadata
in parallel) and a threat model (a list of malicious adversaries and
their capabilities that we are trying to defeat), i think this
paragraph is talking about the latter.

the end result will be the same -- an abort -- but the user will get
to see all the warnings for a particular file, instead of getting them
one at a time.

This makes it easy to get a list of all files that mat2 doesn't know
how to handle, without having to choose -u keep or -u omit.

This allows the user to make use of parser.unknown_member_policy for
archive formats.

At the suggestion of @jvoisin, it also prints a scary warning if the
user explicitly chooses 'keep'.

previously, encountering an unknown member meant that any parser of
this type would abort.

now, the user can set parser.unknown_member_policy to either 'omit' or
'keep' if they don't want the current action of 'abort'

note that this causes pylint to complain about branching depth for
remove_all() because of the nuanced error-handling.  I've disabled
this check.

Rename the Nautilus plugin (removing 'nautilus' from the file name) as
it already lives in its own 'nautilus' directory. The same argument
applies when installing the plugin in a distro.
Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>

Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>

Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>

A .swp file was committed by mistake. Remove it.
Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>

Pixbuf only supports .jpeg files, not .jpg, so libmat2 looks for such an
extension and converts it if necessary. As this check is case sensitive,
processing .JPG files does not work.

Fixes #47.
Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>