This change reduces test failures on my current platform from 48 to 3.
I hope it doesn't break zc.buildout on any other platform.

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- further rmtree fixes for Windows


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  Gottfried Ganssauge) (ajung)


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- allowed to interpolate variables with the environment

- make sure the environment is cleaned

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Remove gibberish paragraph from variable substitution section (was this ever true?), correct next paragraph to reflect current example.

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The 'if not self._valid(ref)' branch is *always* executed because ref still includes the ${} substitution marker around it. Update the _valid regular expression to include the markers, shaving off 4 tests for every substitution.

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with PyPI URLs (the old ones no more working)


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version #. Grrrr.


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selecting Python tests without Python 2.3 available, since I've lost
Python 2.3 in my upgrade to Mac OS X 2.5. :(


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extra uses.


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easier to test multiple versions at once.


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1.0 coming soon. :)


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zc.sourcedistribution.


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leading to test failures.  The change also caused buildout to fail
with Python 2.3, which lacks a set builtin.


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(just replaced the code-block with block, and added a Contents)


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The list of eggs in generated scripts is sorted and duplicates removed. This prevents problems in WingIDE and makes it easier for humans to look at and use the list of eggs.


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Added a configuration option that causes buildout to error if a
  version is picked. This is a nice safety belt when fixing all
  versions is intented, especially whan creating releases.

(This already-desired feature made it easier to write the test for
  the bug fix below. :)

Bug Fixed:

When installing from source releases, a version specification (via a
  buildout versions section) for setuptools was ignored when deciding
  which setuptools to use to build an egg from the source release.


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Oops, forgot CHANGES.txt entry for r81245


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the setup.py script so that the setup.py script can import modules
from the distribution directory.


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