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Command-line and common processing for Docutils front-end tools.
Exports the following classes:
* `OptionParser`: Standard Docutils command-line processing.
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* `ConfigParser`: Standard Docutils config file processing.
Also exports the following functions:
* Option callbacks: `store_multiple`, `read_config_file`.
* Setting validators: `validate_encoding`,
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`validate_boolean`, `validate_ternary`, `validate_threshold`,
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