Preserve en- and em-dashes preferred by HM, validate epubs with EpubC…

…heck, and convert using Calibre ebook-convert to common e-book formats azw3 and kepub

Correct visible TOC at start, and mandatory Navigation piece.

Improvements to the Footnotes edition, and the Hyperlink edition: sty…

…ling, structure and navigation

v2.3 brings nested H2 sections to the TOC, and creates separate books…

… FOOTNOTEs and NOTEREFs.

Resolve page-image presentation issues by simplifying reflow of pages…

… and text

CSS for embedded_page seems to finally fix page images inserted into …

…chapters with and without text and noterefs.

Correct one image dimension

Fix #2 (copyright), Fix #3 (PMD editor), Fix #4 (Front matter: Etymol…

…ogy and Extracts!). Plus improve quality of 1851 page scans and clean up a few HTML characters, and rename the EPUB file.

Fix #1: Chapter XXXIII headings

Fix formatting of list items in README.md