[Xastir] Change to RELAY digipeat function

[James Ewen]

> #2, but proceed with caution after comprehensive testing and
> re-testing, to make sure we're not fooling ourselves.

That's the hard part. To be able to do comprehensive testing, you really 
need to make wholesale changes to all of the parts... You can change 1 
digipeater, but it won't make a difference if the rest of the digipeaters 
still implement the old parameters. The digipeaters need to drop RELAY, and 
home stations need to change their RELAY into WIDE1-1 (only if they are in a 
useful area). The trackers (meaning all APRS stations, mobile (whether full 
blown or dumb), or home stations) need to use WIDE2-2 or less, and if 
absolutely necessary, WIDE1-1,WIDE2-1 to get a boost from the home stations.

Everything needs to make the change to the new parameters to be able to make 
proper quantitative and qualitative analysis of the implications of said 
changes.

James
VE6SRV