[MERGE][bug #295826] Clearer documentation when installing without extensions

[John Arbash Meinel]

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There are some idiosyncrasies of the distutils build process which this
tries to help with.

Namely, when doing "python setup.py install" it doesn't pass any extra
options down to the 'build_ext' command that also gets run. So if you
don't want to build extensions, you have to do:

  python setup.py install build_ext --allow-python-fallback

I added a little bit to the user-guide documentation, and also changed
the error message to (hopefully) make it clearer.

John
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