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

parity/cases/chunkmd/unicode.md

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+# Ἀθῆναι and Μόσχα
+
+Le café était naïve, and the first ligature in that sentence is a single
+codepoint rather than two letters, which is the sort of thing that moves a
+token boundary without moving a character boundary.
+
+東京から来た手紙には、日付が二つ書いてあった。One was the date it was written
+and the other was the date it was meant to be read, and the difference between
+them is the whole subject of this section.
+
+مرحبا — the paragraph above is followed by a right-to-left greeting, then by a
+combining acute on a bare e: é. None of this is unusual in a converted
+book, and all of it has broken a chunker at some point.
+
+Straße, Ægypt, first, ॐ. The list is arbitrary. Its purpose is to be awkward.