[issue6715] xz compressor support

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

> I actually hadn't realized that each section of the library docs had a "sub-index" page like that
That’s multiple-entry navigation :)  You can jump to a module page, or use the index, or use the search, or browse and see the sub-indexes.

As the docs for zlib, gzip, bz2, lzma, zipfile and tarfile are in the archiving subsection, there’s already a link to the subsection index, so I just removed the “See also zlib, etc.” lines (except for the link from zlib to gzip).  I added a link from archiving.rst to shutil and more links and reST targets in shutil.

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Added file: http://bugs.python.org/file23820/archiving-modules-links.diff

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<http://bugs.python.org/issue6715>
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