[chirp_users] Not always DIALOUT

We keep insisting that Linux (and possibly Mac) users add themselves to the "dialout" group.

Didn't work for me. My system allocates /div/ttyUSBx to the "serial" group so if you cannot access your USB/serial ports, check permissions for the /dev/ttyUSBx device to see which group it's a member of.

de Nigel W8IFF/G8IFF