The silc_client_connect_to_[server|client] and

	The silc_client_connect_to_[server|client] and
	silc_client_key_exchange now returns SilcAsyncOperation.
	Fixed client library stopping in case of disconnect, abortion,
	stopping, etc.
	The silc_client_init now takes the running callback as argument
	(remove it from client ops).
	The silc_client_stop now takes stopped callback as argument.