2.8.0

• update version
• recognise interrupt setup failure whichever GPIO library is installed
• serialise SPI access between the interrupt and interfacer threads
• add tests for the vendored RFM69 driver
• harden the vendored RFM69 driver against an unresponsive radio
• include a minimal RFM69 driver rather than depend on rpi-rfm69
• detect the user emonhub is already installed under
• detect whether the raspberrypi configuration is needed
• only apply install steps when needed
• update version
• do not back off at all above a ten minute posting interval
• scale the retry backoff cap to the posting interval
• back off between retries the longer a server has been failing
• update version
• classify the server reply instead of retrying everything that is not 'ok'
• warn once when the buffer fills, and stop re-slicing on every store
• only buffer a frame that was built without error
• replace unencodable values with null instead of killing the interfacer thread

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