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Use "QPDF" only for the QPDF class itself.
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Now --json-output just changes defaults. Allow output file with --json.
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from "qpdf-v2" to "qpdf": [..., ...]
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Also add stubs for top-level QPDF methods (createFromJSON, updateFromJSON)
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This is a massive rewrite of the help text and cli.rst section of the manual. All command-line flags now have their own help and are specifically index. qpdf --help is completely redone.