[TOS] Textbook update: debug chapter

[Greg DeKoenigbserg]

http://teachingopensource.com/index.php/Debugging_the_Code

I lost a bit of this content in a local upgrade on my laptop, which is 
frustrating but not a deal-breaker.  Most of the good stuff remained.

I'd call this chapter roughly 75% done, even though it's short.  To me, 
this is where the rubber really starts to hit the road, and where 
students, having learned the basic, start to become active contributors to 
their chosen project.  Which means:

a. It's exercise heavy;
b. It might be ideal for customization.

Comments, please.  I feel like we're getting very close to having a 
complete first draft of a text that's 90% done -- which is good, although 
we can't get done soon enough for my taste.

--g

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