Log Message:
Updated archivers/lzip to 1.18
------------------------------
2016-05-14  Antonio Diaz Diaz  <antonio@gnu.org>

        * Version 1.18 released.
        * main.cc: Added new option '-a, --trailing-error'.
        * Decompression time has been reduced by 2%.
        * decoder.cc (verify_trailer): Removed test of final code.
        * main.cc (main): Delete '--output' file if infd is a terminal.
        * main.cc (main): Don't use stdin more than once.
        * Removed decompression support for version 0 files.
        * lzip.texi: Added chapter 'Trailing data'.
        * configure: Avoid warning on some shells when testing for g++.
        * Makefile.in: Detect the existence of install-info.
        * testsuite/check.sh: A POSIX shell is required to run the tests.
        * testsuite/check.sh: Don't check error messages.