Check & fix chapter 11. Fix text width to 80 columns
Add new utility to automate typography after check & fix
Check & fix chapter 12. Fix text width to 80 columns
Check & fix chapter 13. Fix text width to 80 columns
Check & fix chapter 14. Fix text width to 80 columns
Check & fix chapter 15. Fix text width to 80 columns
Check & fix chapter 16. Fix text width to 80 columns