[Trlog] 6.79 mode detection

[VR2BrettGraham]

K4RO noted:

>FWIW, it seems that pressing Alt-M won't cycle through
>"DIGI" any longer.  I had to set the radio (an IC-765)
>to RTTY to force TR into digital mode. I think this may
>be different than previous versions. I have to be in the
>RTTY mode to use true FSK keying on the radio, and the
>filter selection is far superior to LSB mode as well.

Interestingly, alt-M cycles through all modes - including
DIG - on the K2.

DIG-reverse on the K2 is awfully useful when the BFO doesn't
go far enough to get the receiver's passband right for narrower
bandwidths & those high tones.

Really miss those narrow filters on 40!

73, VR2BrettGraham