Use MD5 for wire protocol encryption for >= 7.2 client/server.
Bruce Momjian <bruce@momjian.us>
Use MD5 for wire protocol encryption for >= 7.2 client/server. Allow pg_shadow to be MD5 encrypted. Add ENCRYPTED/UNENCRYPTED option to CREATE/ALTER user. Add password_encryption postgresql.conf option. Update wire protocol version to 2.1.