[WriteLog] highlighting rtty callsigns

[K4SB]

Jim Smith wrote:
> Hmm... and here I thought that WL just looked for a DE and a space and
> then accepted everything until the next space as a call. 
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That is my understanding also. What bothered me so much in the test is
all the stations which just sent their call, rather than preceed it
with a "de". Those calls had to be typed in manually, a PITA.

73
Ed