Updated extraction/cache mechanism for zipped resources to avoid inter- process and inter-thread races during extraction.  The default cache location can now be set via the ``PYTHON_EGGS_CACHE`` environment variable, and the default Windows cache is now a ``Python-Eggs`` subdirectory of the current user's "Application Data" directory, if the ``PYTHON_EGGS_CACHE`` variable isn't set.
Updated extraction/cache mechanism for zipped resources to avoid inter-
process and inter-thread races during extraction.  The default cache
location can now be set via the ``PYTHON_EGGS_CACHE`` environment variable,
and the default Windows cache is now a ``Python-Eggs`` subdirectory of the
current user's "Application Data" directory, if the ``PYTHON_EGGS_CACHE``
variable isn't set.

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4041124

pypa/setuptools,pypa/setuptools,pypa/setuptools