Formatting: miscellaneous issues

[gvwilson]

All page numbers taken from the PDF returned by T&F on 2021-03-04:

• p65-66: output of shell command at bottom of p65 shows up on p66.
• p97: output line at top of page should appear on previous page.
• p109: move first line of listing to next page.
• p147: need blank lines before formulas.
• p254: need space before equation.
• p323: the callout box overlaps the title---need to introduce some vertical space.
• p345: replace running section number with "A Solutions" throughout instead of having section numbers (which shouldn't start at 0).
• p470: URL overflows.
• p473: URL overflows.