Unknown members

In dealing with sophisticated MS Word files, it turns out that there are many member elements of the pkzip archive that mat2 doesn't currently know what to do with.

This series is an attempt to make the handling of those unknown members a bit more robust, so that it's easier to get reports about missing handlers, and so that people have a clear choice about what to do with them.

tests/test_climat2.py

@@ -8,13 +8,13 @@ class TestHelp(unittest.TestCase):
     def test_help(self):
         proc = subprocess.Popen(['./mat2', '--help'], stdout=subprocess.PIPE)
         stdout, _ = proc.communicate()
-        self.assertIn(b'usage: mat2 [-h] [-v] [-l] [-c] [-V] [-u] [-s | -L] [files [files ...]]',
+        self.assertIn(b'usage: mat2 [-h] [-v] [-l] [-c] [-V] [-u POLICY] [-s | -L] [files [files ...]]',
                       stdout)
 
     def test_no_arg(self):
         proc = subprocess.Popen(['./mat2'], stdout=subprocess.PIPE)
         stdout, _ = proc.communicate()
-        self.assertIn(b'usage: mat2 [-h] [-v] [-l] [-c] [-V] [-u] [-s | -L] [files [files ...]]',
+        self.assertIn(b'usage: mat2 [-h] [-v] [-l] [-c] [-V] [-u POLICY] [-s | -L] [files [files ...]]',
                       stdout)