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Handle systems with pkg_resources but without setuptools (I am looking at you Ubuntu.. grrr). Fixes LP#410528

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merge lp:~gary/zc.buildout/python-support (also available as svn+ssh://svn.zope.org/repos/main/zc.buildout/branches/gary-launchpad).  This adds support for system Pythons, as well as other changes, such as improved Distribute support and some cleanups.

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Warning when a script name passed in 'scripts' argument of easy_install.scripts
is not defined in an entry point.

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both from command line and from config files.

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Merged -r105475:105584 svn+ssh://reinout@svn.zope.org/repos/main/zc.buildout/branches/reinout_distribute_upgrade_check
This is the fix for an infinite recursion when updating Distribute.
Solved by using the available setuptools/distribute for easy_installing the Distribute tgz instead of searching for it, which tries to install, which searches...

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- Incrementing didn't work properly when extending multiple files.
  https://bugs.launchpad.net/zc.buildout/+bug/421022


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  The standard Python -m option didn't work for custom interpreters.


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  Scripts run using generated interpreters didn't have __file__ set correctly.


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  Scripts generated with relative-paths eanbled couldn't be
  symbolocally linked to other locations and still work.


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  Option incrementing and decrementing didn't work for options
  specified on the command line.


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- When doing variable substitutions, you can omit the section name to
  refer to a variable in the same section (e.g. ${:foo}).

- When doing variable substitution, you can use the special option,
  ``_buildout_section_name_`` to get the section name.  This is most handy
  for getting the current section name (e.g. ${:_buildout_section_name_}).

- A new special option, ``<`` allows sections to be used as macros.


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refer to a variable in the same section (e.g. ${:foo}).

When doing variable substitution, you can use the special option,
``_buildout_section_name_`` to get the section name.  This is most handy
for getting the current section name (e.g. ${:_buildout_section_name_}.


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(Also removed some extra imports and made formatting changes.)


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Conflicts:
	CHANGES.txt
	src/zc/buildout/buildout.py

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  could be inserted into sys.path if a relative path was used to run
  the generated script.


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Also fixed some spurious failures in the bootstrap test.


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``zc.buildout.testing.buildoutSetUp`` installs a new handler in the python root logging facility. This handler is now removed during tear down as it might disturb other packages reusing buildout's testing infrastructure.



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