isc_flush instead of mux_printf, mux_putc and mux_flush.
(async_trailer): Likewise.
(prot_a_async_new_text_old): Likewise.
(prot_a_async_new_text): Likewise.
(prot_a_async_logout): Likewise.
(prot_a_async_new_name): Likewise.
(prot_a_async_forced_leave_conf): Likewise.
(prot_a_async_login): Likewise.
(prot_a_async_send_message): Likewise.
(prot_a_async_deleted_text): Likewise.
(prot_a_async_new_recipient): Likewise.
(prot_a_async_sub_recipient): Likewise.
(prot_a_async_new_membership): Likewise.