I've committed a change that will allow for TOC to be created. It still needs work but it's a start. The text is broken into sections based on h1 tags and the h1 tags themselves are turned into <title> for the section. From what I've found there is not actual TOC for FB2 it is generated dynamically based upon the presence of <section><title>text</title>. It's limited right now because the entire FB2 output code needs to be rewritten. Once that is complete this will work better.
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