Problem: Pattern matching with cond
Problem: Pattern matching with cond

match produces more helpful error messages when failing.

Solution: Replace inner cond with match.

 - Reduce nesting depth by replacing let with define.

dmichiels/fractalide,fractalide/fractalide,fractalide/fractalide,dmichiels/fractalide,fractalide/fractalide,dmichiels/fractalide