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