python - lo: Add encoding space with a bytea entry.

Log Message:
-----------
Add encoding space with a bytea entry. Test in test/encodings.py. __init__ also
includes encoding aliases(pgsql encoding names to python).

Modified Files:
--------------
    lo:
        setup.py (r1.10 -> r1.11)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/lo/setup.py.diff?r1=1.10&r2=1.11)

Added Files:
-----------
    lo/postgresql/encodings:
        __init__.py (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/lo/postgresql/encodings/__init__.py?rev=1.1&content-type=text/x-cvsweb-markup)
        bytea.py (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/lo/postgresql/encodings/bytea.py?rev=1.1&content-type=text/x-cvsweb-markup)
    lo/test:
        encodings.py (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/lo/test/encodings.py?rev=1.1&content-type=text/x-cvsweb-markup)