cc/cirrus_work: revision graph

graph

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working together works well to provide what's needed to update a cdx to include lastmod where possible
Thu, 03 Oct 2024 18:17:55 +0100, by Henry S. Thompson
make into a library, entry point def unpackz(infileName, callback, outfile = None),
Wed, 02 Oct 2024 19:54:45 +0100, by Henry S. Thompson
cleaned up indentation to 2 spaces throughout
Wed, 02 Oct 2024 11:09:58 +0100, by Henry S. Thompson

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