Split debug into a separate topic, and other fixes #79
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Topic 7 required a second level of subheadings, which indicated to me
that debugging should be its own topic. One thing that's missing from this topic
right now is a set of challenges. I added a single challenge, which
I have done while teaching in the past, but additional challenges
would be good too.
This also includes several other fixes so that this repo passes
tools/check.py,except for some things that are currently in discussion in lesson-template.