When extracting an archive that contains './' with the --one-top-level option,
the mode and ownership of '.' would be incorrectly applied to the current
working directory, instead of the requested top-level directory.
* src/list.c (enforce_one_top_level): Map '.' to the top-level
directory.
* tests/Makefile.am: Add onetop05.at
* tests/testsuite.at: Include onetop05.at.
* tests/onetop05.at: New file.
* tests/onetop01.at: Fix keywords.
* tests/onetop02.at: Likewise.
* tests/onetop03.at: Likewise.
* tests/onetop04.at: Likewise.
Make sure the changes become visible with --show-transformed-names.
* src/common.h (strip_compression_suffix): New function.
(one_top_level): Rename to one_top_level_dir. All uses changed.
* src/extract.c (extr_init): Use strip_compression_suffix.
Bail out if unable to determine top-level directory.
(maybe_prepend_name): Remove. All uses removed.
* src/tar.c (options): --one-top-level takes optional argument.
(parse_opt): Handle it.
* src/list.c (enforce_one_top_level): New function.
(transform_stat_info): Call enforce_one_top_level if required.
* src/suffix.c (compression_suffixes): List "tar" (no compression);
terminate with NULL entry.
(find_compression_suffix): New static.
(strip_compression_suffix): New function.
* doc/tar.1: Update.
* doc/tar.texi: Update.
* tests/onetop01.at: New testcase.
* tests/onetop02.at: New testcase.
* tests/onetop03.at: New testcase.
* tests/Makefile.am: Add new testcases.
* tests/testsuite.at: Likewise.
