[Xastir] Change to RELAY digipeat function

[Curt Mills]

The relay digipeat function has been changed.  It now digipeats with
callsign substitution for RELAY and for WIDE1-1, as per the latest
recommendations that were discussed on the APRSSIG mailing list
recently.

-- 
Curt, WE7U.				archer at eskimo dot com
http://www.eskimo.com/~archer
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