Chapter 9 Tutorial draft finished.
Chapter 9 prepare merge
Chapter 9 Hardware description.
Chapter 9 remove use of fixed point.
Chapter 9 merge origin.
Merge branch 'feature/Chapter9-potentiometer' of ssh://git.code.sf.net/p/pi-ada-tutorial/code into feature/Chapter9-potentiometer
Chapter 9 cleanup code
Chapter 9 merge origin