[Distutils] Setuptools Bug: all files installed +x

[Pete]

On both linux & OS X, Setuptools installs all .py/.pyc files with mode  
a+x (executable for all users).  This occurs regardless of original  
the permissions in the source tarball.  Doing so breaks nosetests,  
which by default refuses to import executable files for test-discovery  
purposes as a safety measure.

This behavior is broken & dangerous.

-- 
Pete
pfein at pobox.com