- key term hyperlinks for distutils, setuptools & wheel
- distutils landing page links directly to setuptools docs
- short summary of setuptools benefits provided with link

- based on pip and other PyPA tools
- includes references to the new Python Packaging User Guide
  where appropriate (and the relevant section is at least
  partially filled in)
- started new FAQ sections
- both guides aim to introduce users to basic open source
  concepts if they aren't aware of them
- existing guides have been relocated (now linked from the
  distutils docs) rather then removed, since there is
  some needed material that has yet to be relocated to the
  distutils docs as a reference for the legacy formats

Distutils2 will live on on PyPI and be included in the stdlib when it
is ready.  See discussion starting at
http://mail.python.org/pipermail/python-dev/2012-June/120430.html

Also promote notices from distutils doc to deprecation boxes.

This updates the user guide to refer to Packaging instead of Distutils.
Some files still require an update.