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Nicer debug output for index record headers
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Properly decode the boundary index list in the Index Header
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Remove incorrect trailing bytes check from mobi 6 deump code and put a correct version in the mobi 8 dump code
Dump the index record geometry by using the IDXT table
Code cleanup
AZW3 Output: Add support for converting documents with very large table of contents (with more than 2000 entries). Fixes #1250475 [epub conversion error to azw3 - multiple index](https://bugs.launchpad.net/calibre/+bug/1250475)