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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.
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Handle optional choices in addition to required choices. Refactor the way help options are added to completion to make it work with optional help choices.
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Move ArgParser from qpdf.cc into QPDFJob.cc. It still works with millions of public member variables, but now qpdf.cc is minimal and just calls stable library functions.
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Remove comparison of qpdf CLI version with library. With almost all the functionality moving into the library, this check is no longer meaningful.
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Convert remaining static functions that take QPDFJob& as a parameter to member functions. Utility functions that don't take QPDFJob& remain static functions and can probably just stay that way since the keep extra complexity out of QPDFJob.hh.
