Remove some dead code in fixup_lists.
fixup_lists: change stack to linked list
fixup_lists: Add comments and warn about cases where the HTML numbering replicates the Word numbering. Surprisingly there are many of these (filed <https://bugs.ecmascript.org/show_bug.cgi?id=1717>) and in most cases the HTML is correct and the Word document is wrong! However this did also discover a few bugs in the script (#22, #23, #24, #25, #26).