Improving Jeelink and RFM2Pi compatability

Not entirely sure why, but the Jeelink v3 rfm69 device needs a longer wait time for a serial response. It 's highly likely that the serial code is needs "optimising".

Auto baud setting, firmware version logging and configuration confirmations now tested on
RFM2Pi v2 rfm12 running older RF12demo firmware (pre-"v" version)
RFM2Pi v2 rfm69 running RF12demo.12 
JeeLink v3 rfm69 both "rfm2pi" and "original" versions of RF12demo.12 tested ok