Make /usr/bin/unit2-[2|3] part of the standard install

[GoogleCodeExporter]

Currently, there is no way to pick whether to run unittest2 or unittest2py3k. 
There is only one symlink, /usr/bin/unit2, that may link to either executable. 
There are executables for minor Python versions, but there is no executable to 
specify the Python major versions.

Instead, provide these links:

/usr/bin/unit2-2 -> /usr/bin/unit2-2.x

/usr/bin/unit2-3 -> /usr/bin/unit2-3.x

I don't really grok setuptools, hence the lack of a patch.

Original issue reported on code.google.com by [email protected] on 14 Mar 2011 at 10:07