Update to PyGreSQL 2.3.

src/backend/libpq/pqcomm.c

src/include/port/sco.h

src/interfaces/python/Announce

src/interfaces/python/ChangeLog

src/interfaces/python/README

src/interfaces/python/advanced.py

src/interfaces/python/basics.py

src/interfaces/python/func.py

src/interfaces/python/mkdefines

src/interfaces/python/pg.py

src/interfaces/python/pgext.py

src/interfaces/python/pgmodule.c

src/interfaces/python/pgtools.py

src/interfaces/python/syscat.py

src/interfaces/python/tutorial/advanced.py

src/interfaces/python/tutorial/advanced.pyc

src/interfaces/python/tutorial/basics.py

src/interfaces/python/tutorial/func.py

src/interfaces/python/tutorial/func.pyc

src/interfaces/python/tutorial/pgtools.py