Make some episodes optional content #54
Merged
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This PR merges in changes to make 1.5 episodes optional. What I have done is kept the first part of Episode 7 "Advanced Communication Techniques" as part of the core text of the course, renaming that episode to "Derived Data Types." This episode now only deals with communicating vectors and sub-arrays. The two remaining sections of that episode have been moved into an optional episode at the end of the course, with one reference to it in the part of the text which has been text. I have also moved Episode 8 "Common Communication Patterns" to the end, making it optional as well.
There are also a few changes of code style normalisation I missed in an earlier bit of work.