SIG table only processed once

[argilo]

libnrsc5 only processes the SIG table the first time it is seen:

nrsc5/src/output.c

Lines 467 to 471 in 20de3b2

	if (st->services[0].type != SIG_SERVICE_NONE)
	{
	// We assume that the SIG will never change, and only process it once.
	return;
	}

This seems like a bad design, since a station could update its SIG table, or a different station's signal could arrive at the input. When changes to the SIG table occur and libnrsc5 ignores them, error messages like the following begin appearing:

port 0404 not defined in SIG table
port 0402 not defined in SIG table
sequence too large (-835829692)
sequence too large (136251704)

[argilo]

In a similar vein, the Configuration Control Channel (CCC) is only processed once:

nrsc5/src/frame.c

Lines 402 to 404 in 20de3b2

	// ignore new CCC packets (XXX they shouldn't change)
	if (ccc_data->fixed_ready)
	return;