[fluksod] fix model and serial being stored as hex
[avr] move v2.2 code to avr/b
[avr] re-locate rfm12 submodule
[avr] introduce two sensor board targets
[avrdude] create two distinct gpio targets
[fdude] include support for FLM02A/B variants
[fluksod] adapt init script to work with FLM02A/B
[fdude] use exece iso execp for launching avrdude