barometer: uses new Adafruit barometer library
clock: now sends 'c' iso 'r' during initialise
commands: updated showVersion function
grove: added diagnostic prints
sleep: added diagnostics; interrupt now disables WDT
xrf: added diagnostics; improved detection of XRF wake-up (removes
infinite loop)
mikeWeatherStation: diagnostics; new XRF define; WDT vector moved to
sleep module