As a consequence, only one pin is currently suppored.
AddPin will not really add a new pin, just replace the configuration
of the existing pin.
The motivation for this limitation is that 'new' costs a lot of
program memory.
Remove unused libraries.
Add default CS/CE pin to Config.h
Add new variebles for voltage and current.
Add new internal command sent to controller when gateway is ready and online
Henrik Ekblad
Patrick Fallberg