[time-nuts] GPScon running on Raspberry Pi 3b

[Mark Sims]

Heather's configuration priority is to process:  hard coded defaults,  then the config file,  and finally the command line options.  This lets you set your preferred settings in the config file and then override your config file options from the command line. 

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> When I ran it with ./heather -4u, it first told me that it was unable to open /dev/ttyUSB0 and
then told me it was unable to open /dev/ttyUSB3. This is probably due to the
configuration file containing "-1u", but if that option is given on the
command line then the configuration file value should be ignored - or at the
least it should be tried after the command line option.