Add lzip compression support.

Add lzip compression support.

* automake.in (handle_dist): Recognize dist-lzip.
(make_paragraphs): Map LZIP to dist-lzip.
* doc/automake.texi (Dist): Add dist-lzip.
(Options): Likewise.
* lib/Automake/Options.pm (_process_option_list): Add dist-lzip.
* lib/am/distdir.am
(dist dist-all): Add command to create an lzip-compressed tarball.
(distcheck): Handle lzip-compressed tarballs just like the others.
* tests/defs.in: Test for lzip, too.
* tests/lzip.test: New file, based on nogzip.test.
* tests/Makefile.am (TESTS): Add lzip.test.
* NEWS: Update.

Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>