setuptools and zc.buildout.

Don't upgrade if the buildout command is non-local.


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  setuptools as one of its dependencies, we now treat setuptools as an 
  implicit dependency.  We generate a warning if the distribution
  is a develop egg.

- Remove old develop egg links. This requires storing the old link
  paths in .installed.cfg.


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----------

Non-zip-safe eggs were not unzipped when they were installed.


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__file__ to fail.


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paths were used, causing setup to fail when run from a different
directory.

Updated release information.


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versions.

Fixed a bug in installing by direct egg download.


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the version of python used to run the tests is not Python-2.3.

Use pypi as the index when running these tests. This is,
unfortunately, necessary because when installing a source distro for
another version of Python, we need to download setuptools for the
desired version.  Maybe in the future we can figure out a way for the
tests to use a local copy of setuptools.


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egg is not important.


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API. This allowed the tests to be simplified somewhat.


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https://launchpad.net/products/zc.buildout/+bug/60582

Don't use extensions when bootstrapping.


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This makes things go a little faster, makes errors a little easier to
handle, and allows extensions (like the sftp extension) to influence
more of the process.


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adding sftp support to buildouts that need it.


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