[aprssig] D710A APRS status text details

[Robert Bruninga]

> I really like the "magic" entry in status text 5 that 
> transmits the frequency of the "other side" as
> part of the status text. Some experimentation leads me to
believe that
> 
> - the frequency text is always there in status 5
> - it's possible to add text after the frequency
> - the PL/offset information is never there
> - it's not possible to get the frequency information into any 
> of the other status messages

Yes, you got it.  
Making it applicable to all texts is my hope...

Bob, WB4APR