set_error_verbosity (PGconn)

    /*
     * call-seq:
     *    conn.set_error_verbosity( verbosity ) -> Fixnum
     *
     * Sets connection's verbosity to _verbosity_ and returns
     * the previous setting. Available settings are:
     * * PQERRORS_TERSE
     * * PQERRORS_DEFAULT
     * * PQERRORS_VERBOSE
     */
    static VALUE
    pgconn_set_error_verbosity(VALUE self, VALUE in_verbosity)
    {
            PGconn *conn = get_pgconn(self);
            PGVerbosity verbosity = NUM2INT(in_verbosity);
            return INT2FIX(PQsetErrorVerbosity(conn, verbosity));
    }