forms of the distribution name and version, so that distribution files will
be generated with parseable names (i.e., ones that don't include '-' in the
name or version).  Also, this means that if you use the various ``--tag``
options of "egg_info", any distributions generated will use the tags in the
version, not just egg distributions.

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4041092