[time-nuts] Change COM Port in Lady Heather

[Mark Sims]

If you are using the Linux / macOS version of Lady Heather the com port selection rules are a bit different.  You specify a com port number 1 greater than the operating system device number.  This horrible kludge is due to the fact that Linux starts numbering com ports from 0 and Windows starts at 1.  /0 is used to disable the com port.   Or for Linux and macOS you can use /id=device_name to specify the device name.

Also for Linux / macOS and you are using a USB connected serial device / cable you need to put a "u" after the 
device number.  "/1u"  (or "-1u", command line options can start with either "/" or "-") specifies device "/dev/ttyUSB0", etc.  macOS uses "/dev/tty.usbserial#" as the device name