python - ex: Relocate project into the lo module.

Log Message:
-----------
Relocate project into the lo module.

The 'lo' module has been acquiring many features, and it seems natural to
incorporate this into 'lo' as well.

Removed Files:
-------------
    ex:
        LICENSE
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ex/LICENSE)
        MANIFEST.in
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ex/MANIFEST.in)
        README
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ex/README)
        setup.py
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ex/setup.py)
    ex/src:
        __init__.py
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ex/src/__init__.py)
        code.py
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ex/src/code.py)
        prime.py
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ex/src/prime.py)
    ex/test:
        code.py
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ex/test/code.py)
        prime.py
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ex/test/prime.py)