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Summary
SUMMARY: None
Purpose of change
See if I can improve the user friendliness of character header in such a manner that doxygen can read it
Describe the solution
Mostly take the existing doc and just format is slightly differently for doxygen. Add some doc where I can (avoiding stating the obvious).
Describe alternatives you've considered
Some of my comments might be close to stating what is obvious. Stating the obvious is counter-productive; it makes the code less user friendly.
I'm not yet capable enough to doxygenate the entire file. Hopefully piecemeal modifications aren't distracting. FWIW this concern is somewhat lessened because the comments weren't uniform to begin with.
Additional context
This PR isn't seeking to be comprehensive. My main goal is do no harm and not get in the way. Secondary goal is to modestly improve the readability of the code. Also hoping to learn more about how doxygen works and stumble upon something cool it can do.