Removed experimental arduino work

Fixed failed merge

Merge branch 'long-tx'

Improved configurability of message repeat patterns. ...

Tested with different repeat lengths.
Optimum seems to be 8 inner, 1 outer transmits

Turned off TRACE on raspberry pi build

Tested with learning mode. ...

Works with all 4 switch patterns.
Can now independently switch 4 switches.
Some occasional RF reliability problems that need measuring.

Implemented mode switching logic. ...

This is so you can just say radio_standby()
Then radio_transmit() and it pops to standby at end of transmit.
Or, radio_receive()
Then radio_transmit() pops back to receive at the end.
Also massive tidy up and trimming out old comments.

Improved flow of code, specifically radio_transmit() ...

Pushes previous mode and restores at end of transmit.
This should auto-return to standby or receive as appropriate.
This will make it easier to implement mode hopping schemes later.

Simulation gets further now due to gpio_sim detection

Started design of new long payload transmitter

Initial design of new radio transmit scheme

radio_rpi.so now built as part of the pi build process ...

legacy.py now uses the prebuilt radio_rpi.so

encoder now adds preamble. ...

lecacy.py now uses new C radio driver

Tested radio2.py on Raspberry Pi, now works with OOK transmit

Tiny tidy up

Renamed encoder_test to be consistent with other testers

Wrote radio2_test.py as a python OOK tester for new radio.so lib

radio2.py ctypes wrapper ready for testing

Preparations for new radio interface added to the architecture

Tweaks to radio_test.c layout

Tidied up radio_test.c readability

Removed unnecessary spurious radio configures

Fixed payloadlen bug that was introduced in API refactoring ...

Note: Reconfigures as OOK regularly, unneccesarily now

Fixed bug with OOK struct size in hrfm69_test.c

Finished coding radio_test and radio(tx) module

First pass of spec'ing radio.h/c and radio_test.c

Can now reliably turn energenie switches on and off with hrfm69_test.c

Coded a better payload transmit test routine for OOK

Started coding up new burst transmission scheme

Started to write another test case to blurt out OOK energenie messages. ...

This is only a test case.
But it has highlighted a whole load of discrepancies in the original C
code to do with payload length calculation, and the 'magic' zero byte
at the start of the buffer for stuffing the SPI register address in.