[Distutils] Buildout bootstrap script now works when other setuptools versions are installed.

[Jim Fulton]

I just fixed a bug in the zc.buildout bootstrap script:

   http://svn.zope.org/*checkout*/zc.buildout/trunk/bootstrap/ 
bootstrap.py

That caused boostrapping to fail when an old setuptools was installed  
in the Python path (e.g. system Python).  Now, the system Python is  
used if it's available and ez_setup  is used only if necessary.  Not  
only does this avoid failures when older versions of setuptools is  
installed, but also makes bootstrapping a little faster when  
setuptools is installed locally.

People including bootstrap.py in their projects should update to the  
new version.

Jim

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