#909 processinterface for Raspi

[Waldemar Eisenmenger]

here is an processinterface for RasPi, which should work with the new IX and QX functionblocks. I tested the functionblocks with a simple blinky app and it works.
I use the wiringPi library here.

[Zoitl Alois]

thanks for the patch it has been accepted as is and is available in cset [forte:aae803].