whoops, default is now to leave DATAFLASH disabled
implement frequency adjustment in RF69 fixes #434
whoops, wrong default (again!)
compiler config line, and also report c1 setting separately
add frequency display to the "o" command

closes #438
fix compiles with newer avr-gcc's, fixes #440

a better solution will be to adjust the code to avoid this deprecated
use of the prog_* types
Merge branch 'RF12demo-v11'
improve RF69/RF12 interoperability, see #439
Merge branch 'master' into RF12Demo