Merge remote-tracking branch 'origin/devel-2.5'

Conflicts:
        Makefile.am    (trivial, test data files added on both branches)
        lib/opcodes.py (trivial, master renamed filter→qfilter, 2.5
                        fixed the type of the parameter)

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>