suggested improvements to structure and readability of large text blocks

6.4 and 6.41 rewritten for better structure and readability.

As a former technical writer I learned that much of the understanding of documents such as this depends on good structure and readability of the text itself. I applied some of these principles to abovementioned chapters. These should be peer-reviewed for completeness and correctness.
Github flavoured markdown does not seem to support tables, other than common html tables. A large text such as this could be much improved by using colums with navigational elements. Therefore it's a great pity we can't use columns; I spent a day trying to accomplish this but it didn't work out. However, it is my understanding that marked-down text lend itself very well to further (automated) formatting in HTML. This  brings me to the question in what format the spec is delivered to the involved standardization institute after we reacht the final version 1.0 freeze here on github some time from now?