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

parity/cases/chunkmd/contents.md

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+# Contents
+
+Preface......vii
+One. The Setting......1
+Two. The Quarrel......22
+Three. The Break......45
+Four. The Settlement......70
+Five. After the Settlement......99
+Appendix A. The Renders......121
+Appendix B. The Mills......134
+Bibliography......150
+Index......161