Flipped the definitions of GPIO_SET and GPIO_CLR due to the inversion introduced with the transistor board.
Flipped the definitions of GPIO_SET and GPIO_CLR due
to the inversion introduced with the transistor board.

ianrenton/raspberrytank,ianrenton/raspberrytank,ianrenton/raspberrytank,ianrenton/raspberrytank,ianrenton/raspberrytank