Update copyright year.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Use a larger slop size for bsdiff.

Original patch by Ray Cheung.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Don't require write permission in read_file()

Original patch by Ray Cheung.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Fix warning spotted by clang.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Update AUTHORS.txt

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Be less verbose by default (when built with -DNDEBUG)

Original patch by Ray Cheung.

Signed-off-by: Austin Seipp <aseipp@pobox.com>