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John MacFarlane
ebdcf75276
In pandoc 2.7 we assumed that every class with chapters would accept `\frontmatter`, `\mainmatter`, and `\backmatter`. This is not so (e.g. report does not). So pandoc 2.7 breaks on report class by including an unsupported command. So we replace the book-class variable in the template with two variables, has-chapters and has-frontmatter, and set these intelligently in the writer. Closes #5348.