Merge pull request #6 from CdLbB/master

Fix typos in 7.7 and 7.8 PLUS correction of formula in W&W's original
Fix some warnings generated by sanitychecks.py
Fix broken compilation in Ch. 9
Fix more warnings from sanity checker
Work on 9.2.2
Work on 9.2.2
Merge remote-tracking branch 'upstream/master'