chunkmd: page and chapter aware chunking, roles, footnote flag

parity/cases/chunkmd/epub-ish.md

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+## Chapter One
+
+There are no page markers in this text, because the format it was converted
+from had none. A chunker that needs pages will produce nothing useful here,
+and one that falls back to character position will find the chapter correctly.
+
+The chapter itself concerns the difference between a right and a habit. A
+right can be pleaded; a habit can only be described. The men in these records
+pleaded habits as though they were rights, and the courts, with a patience
+that is easy to underestimate, let them.
+
+## Chapter Two
+
+The second chapter takes the same question into a period where the records are
+better. Better records make the problem worse rather than easier, because they
+show how much of what looked like custom was in fact a settlement of a dispute
+that had gone the other way a generation earlier.
+
+Custom, in this reading, is the name given to the outcome of a quarrel nobody
+alive remembers having. It is stable exactly as long as the memory of the
+quarrel is dead and the conditions that produced the settlement persist. When
+either changes, custom turns out to have been a treaty all along.
+
+## Chapter Three
+
+What remains is to say what this means for the wider argument, which is less
+than it might appear. The valley was not typical. It was chosen because its
+documents survive, and documents survive where somebody had a reason to keep
+them, which is itself a fact about the place.