More proofing tweaks to the reviews
HT sent more fixes from the proofing PDF, and so I made those. The changes to NVD's review sent by the author last week have precipitated a screw-up in the page-break setup, because they've pushed subsequent reviews forward, causing a widow problem. Fixing this was really difficult, and I've ended up having to use keeps and breaks in profusion, which has resulted in some short pages (where content is pushed to the next page to avoid widows). This is really the best we can do; the situation arises because of the large number of reviews (10), and the length of headers (typically up to four lines) and footers (two or more lines) for each review, which mean that the chances of widows/orphans arising is very high. With a smaller number of reviews, there's a better chance that messing around with the vertical spacing between them can solve the problem, but it's not really possible in this case.