👇 Click on the image for a new way to code review
####
[![Review these changes using an interactive CodeSee Map](https://s3.us-east-2.amazonaws.com/maps.codesee.io/images/github/tealeg/xlsx/774/26995a2a/3ff194b2acdce296f467c09560cd8aa6e8844784.svg)](https://app.codesee.io/r/reviews?pr=774&src=https%3A%2F%2Fgithub.com%2Ftealeg%2Fxlsx)
#### Legend
It looks like
dump.xml
are merely dumping XML rows that are never read back.As such it is unnecessary and might cause unexpected errors when the program is called in a read-only directory/FS without serving any purpose.