Add test_004. This tests options that are often used when sending
flawfinder output to other tools. In this case,
we test -m, -S, -D, -C, and --quiet.
This also begins a convention change, to name tests e.g., "test_001".
This ensures that the tests sort reasonably without special options.
Signed-off-by: David A. Wheeler <dwheeler@dwheeler.com>