Funnerator/simple_xlsx_reader — pull request #1 by marktorrance (2013-06-11 05:42:59+00:00)
Title: Fix indexes when worksheets have been deleted

I found an xlsx document where some sheets had been deleted (I think). The remaining sheets are numbered 1, 4 in the TOC, but just numbered 1, 2 in the XML structure. I believe the fix I'm checking in here will fix this generally.