Mention the -r option when we can't find our reference files.
Export the seekable and streamable zip readers separately
to simplify testing.
Add tests to verify that the seeking Zip reader can correctly
ignore padding at beginning or end.  Fix Issue #257.
Merge branch 'master' of github.com:libarchive/libarchive
Issue 332: Be more careful guessing file mode information from
incomplete Zip archives.  In particular, some epub files have
0 in the file type part of the mode field.