Fixed compile error.
Putting back default trace object parameter to print methods.
Ripple effect of changes to IOStream (Base).
Fixed include of Board.hh to allow ATtiny to ignore print/IOStream/trace.
Board::A8 was removed. Ripple effect; changed to A5.
Add compile time check of board; this example sketch is Arduino Mega only.
Prepare NEXA example for ATtiny.
Update VWI example sketches; key, sender and receiver so they work together.