Added several new functions to support the PostgreSQL v3 protocol

introduced in PostgreSQL 7.4.

(PHP pg_transaction_status) New function to get in-transaction status of
                            a database connection.

(PHP pg_query_params) New function to allow execution of parameterized
                      queries.

(PHP pg_prepare) New function to allow preparing named queries.

(PHP pg_execute) New function to allow execution of named prepared
                 queries.

(PHP pg_send_query_params) New function that is the async equivalent of
                           pg_query_params.

(PHP pg_send_prepare) New function that is the async equivalent of
                      pg_prepare.

(PHP pg_send_execute) New function that is the async equivalent of
                      pg_execute.

(PHP pg_result_error_field) New function that allows highly detailed
                            error information, most importantly the
                            SQLSTATE error code

# Regression tests are included for all but 2 functions, the rest will
# follow shortly.  Docs will also follow shortly.

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