Exercises 6 and 7
Typo in doc
Clarification around some of the questions
Clarification on first question, using linear conversions in an area conversion question
More doc clarification
Missed parameter on stepreversesign. Oops :-/
Merge branch 'master' into solutions

Conflicts:
	5-recursion.hs
Answers to chapter 6
Answers to chapter 7