[chirp_devel] Patch to fall back to slower baud rate for Alinco DJ-G7EG (#4355)

[Mathias Weyland]

Hello guys

According to #4355, Alinco support suggests to try slower baud rates 
with their official programming software if the default rate of 57600 
baud does not work. Unfortunately, their own software does not seem to 
have a setting for the baud rate, but we have a documented case in the 
bug report where reducing the baud rate in chirp did allow for an image 
transfer at the expense of slowing down the procedure.

This patch retries at 19200 baud if the default of 57600 baud fails. 
That's kind of the best of both worlds -- users with good cables can 
benefit from the fast rate and users with dodgy(?) cables can still use 
the software. This patch also adds chirp_common.RadioPrompts() dialog 
boxes to tell the user how to put the radio into programming mode, and 
to inform him about the two baud rate options. It logs failed attempts 
at the fast rate. I'd like to move the instructions to a dedicated tab 
and instead pop up the dialog box instead of logging that condition, but 
I can't seem to get around it. This is why I'm handing in the patch as 
is for now, since at least one other user has asked for the feature 
already.

Comments are welcome as usual.

Regards and thank you

Matt
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