Update for PyGreSQL 3.0, from D'Arcy J.M. Cain

doc/TODO

src/interfaces/python/Announce

src/interfaces/python/ChangeLog

src/interfaces/python/PyGreSQL.spec

src/interfaces/python/README

src/interfaces/python/README.linux

src/interfaces/python/mkdefines

src/interfaces/python/pg.py

src/interfaces/python/pgdb.py

src/interfaces/python/pgmodule.c

src/interfaces/python/pgsqldb.py

src/interfaces/python/setup.py

src/interfaces/python/tutorial/advanced.py

src/interfaces/python/tutorial/basics.py

src/interfaces/python/tutorial/func.py

src/interfaces/python/tutorial/pgtools.py

src/interfaces/python/tutorial/syscat.py