Summer update


I have now added many comments into the text (thanks to those of you who contributed) and (thanks to John Connor) almost completed the cross-referencing. The text is now essentially complete as a “second edition”, and all that remains – for this iteration – is to check that all the links are current and alive.  It is not too late for further comments, especially if they relate to new developments I have missed.  As you will see, I have tried to acknowledge by name everyone whose contribution I have used.


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