Chapter 5.5: Compiler
Renamed ndpar-5.5.rkt -> ndpar-compiler.rkt
Exercise 5.31
Exercise 5.32
Compiled factorial and factorial-alt
Annotated factorial and factorial-alt with comments
Exercise 5.34
Exercise 5.35
Moved/copied all compiler and evaluator code to separate directory
Moved compiled- procedures from compiler.rkt to primitive.rkt
Moved the-global-environment from primitive.rkt to evaluator.rkt
Chapter 5.5.7: Running compiled code in evaluator

To make it work I had to
- revert exercise 5.9, because labels are valid operands now;
- revert exercise 5.10, and reintroduce branch instruction
Moved examples to seprate directory
Removed error handling
Exercise 5.48
Minor cleanup
Exercise 5.45
Exercise 5.46
Reshuffled code

Hopefully didn't break anything
Exercise 5.36