Make "make test" fully operational.

MFC after:	2 weeks

violated ECMA-119 (ISO9660): allow reserved4 to be 0x20 in PVD.
This allows tar to read FreeBSD distribution ISO images created
with makefs prior to NetBSD bin/45217 bugfix (up to 9.0-BETA1).

In addition, merge following important bugfixes from
libarchive's release/2.8 branch:

Revision 2812:
Merge 2811 from trunk:  Don't try to verify that compression-level=0
produces larger results than the default compression, since this isn't
true for all versions of liblzma.

Revision 2817:
Merge 2814 from trunk: Fix Issue 121 (mtree parser error)
http://code.google.com/p/libarchive/issues/detail?id=121

Revision 2820:
Fix issue 119.
Change the file location check that a file location does not exceed
volume block. New one is that a file content does not exceed volume
block(end of an ISO image). It is better than previous check even
if the issue did not happen.

While reading an ISO image generated by an older version of mkisofs
utility, a file location indicates the end the ISO image if its file
size is zero and it is the last file of all files of the ISO image,
so it is possible that the location value is the same as the number
of the total block of the ISO image.

http://code.google.com/p/libarchive/issues/detail?id=119

Revision 2955:
Issue 134:  Fix libarchive 2.8 crashing in archive_write_finish() when
the open has failed and we're trying to write Zip format.

http://code.google.com/p/libarchive/issues/detail?id=134

Revision 2958:
Followup on Issue 134:
 1) Port test_open_failure to libarchive 2.8 branch to test
    the problem reported in Issue 134.
    This test also shows that archive_read_open() sometimes
    fails to report open errors correctly.
 2) Fix the bug in archive_read.c
 3) Comment out the tests that close functions are invoked
    promptly when open fails; that's fully fixed in libarchive 3.0,
    but I don't think it's worth fixing here.

Revision 3484:
Use uintmax_t with %ju

Revision 3487:
Fix issue 163.
Correctly allocate enough memory for a input buffer saved.

http://code.google.com/p/libarchive/issues/detail?id=163

Revision 3542:
Merge 2516, 2536 from trunk:  Allow path table offset values of
0 and 18, which are used by some ISO writers.

Reviewed by:	kientzle
Approved by:	re (kib)
MFC after:	3 days

- Add support for extracting xar and rpm archives
- Add libarchive_fe subdir (common code for tar and cpio)

Approved by:	kientzle
MFC after:	2 weeks

mtree files.

access to the file data (if the file exists on
disk).  This was broken for the first regular
file; fix it and add a test so it won't break again.

In particular, this fixes the following idiom for creating
a tar archive in which every file is owned by root:

tar cf - --format=mtree . 	\
    | sed -e 's/uname=[a-z]*/uname=root/' -e 's/uid=[0-9]*/uid=0/' \
    | tar cf - @-

even when we exit on an error.

tweaks:  Support nanosecond timestamps, handle attributes broken
across multiple lines.

timestamps on Tru64, AIX, and GNU Hurd.  Thanks to Björn Jacke.

This implements the new generic options framework that provides a way
to override format- and compression-specific parameters.

This is an attempt to eliminate a lot of redundant
code from the read ("decompression") filters by
changing them to juggle arbitrary-sized blocks
and consolidate reblocking code at a single point
in archive_read.c.

Along the way, I've changed the internal read/consume
API used by the format handlers to a slightly
different style originally suggested by des@.  It
does seem to simplify a lot of common cases.

The most dramatic change is, of course, to
archive_read_support_compression_none(), which
has just evaporated into a no-op as the blocking
code this used to hold has all been moved up
a level.

There's at least one more big round of refactoring
yet to come before the individual filters are as
straightforward as I think they should be...