Add a new rename command to change the headers #223
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I see that I many times need to rename the headers of a CSV. I know this can be done by editing the first line but that is not possible when you read it from a compressed file or when the file is really big it can make your computer burn :)
This is an easy to use and implement approach, I didn't wanted to shadow the functionnalities of the select command and didn't allowed the user to change the order of the headers fields. Also it doesn't support modifying the names of only some of the headers.
What do you think about this PR?