* dbusbind.c (Fdbus_get_unique_name, xd_read_message)

* dbusbind.c (Fdbus_get_unique_name, xd_read_message)
(Fdbus_register_signal): Use DBUS_MAXIMUM_NAME_LENGTH and
DBUS_MAXIMUM_MATCH_RULE_LENGTH for string lengths.
(Fdbus_call_method, Fdbus_send_signal, Fdbus_register_signal):
Unify argument lists.
(xd_read_message, Fdbus_register_signal) Reorder and extend event
arguments and hash table keys.  Use unique name for service.
(Fdbus_unregister_signal): Remove checks.
(Vdbus_registered_functions_table): Fix doc string.