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

parity/cases/chunkmd/paged.md

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+This preface was set before the pagination began, and any tool that starts
+reading at the first page marker will lose it. That has happened, and it cost
+a book all but two thousand of its characters.
+
+<!-- Page 1 -->
+
+# I. The Setting
+
+The valley is twelve miles long and never more than two wide. At its northern
+end the river enters through a gorge that no road followed until the last
+century; at its southern end it leaves through a marsh that no road follows
+yet. Everything that happened here happened to people who could not easily
+leave, and who knew it.
+
+The population in the first surviving survey is given as four hundred and six
+households, which at the usual multiplier means somewhere near two thousand
+people. That figure held, within a tenth either way, for three hundred years.
+
+<!-- Page 2 -->
+
+What changed was not how many people lived in the valley but what they owed
+for the privilege. The earliest schedule lists eleven separate renders, seven
+of them in kind. The latest lists two, both in coin. Between those two
+documents lies the whole of the argument.
+
+It would be convenient to say that the change was gradual. It was not. Two
+thirds of it happens in a single generation, in the middle of the fourteenth
+century, for reasons the documents do not give and which have to be supplied
+from outside.
+
+<!-- Page 3 -->
+
+# II. The Quarrel
+
+The quarrel began over a mill. It nearly always does. A mill is the one piece
+of capital in a village that everybody must use and only one person can own,
+and the law of the mill is therefore the law of the place in miniature.
+
+The lord's mill stood at the northern end, where the fall was steepest. The
+abbey's mill stood two miles downstream, on land the abbey had been given by a
+man whose grandson disputed the gift. Both houses claimed the right to compel
+the valley's tenants to grind at their own stones, and both were prepared to
+break the other's.