csvFormat: CR without LF

[camisotro]

I ran into an interesting edge case. I was working with a data set emanating from a Windows environment, hence some fields derived from long text areas had CRLF line breaks. For reasons having to do with the destination of this data, I was asked to make a copy of one such column and truncate it to 250 characters.

It turns out that since JS treats the CR and LF separately, in some records it truncated directly between the CR and LF. When I used d3.csvFormat and fs.writeFileSync to save the output to a CSV file, I found an issue. Any field terminating in a CR (without an LF) was not surrounded in quotes. As a result several other programs had difficulting opening this file. When I manually quoted the field, it opened fine in other programs.

So... would it be possible to get the CSV/DSV module to recognize a lone CR as grounds to surround the field in quotes? :)

[mbostock]

Fixed in #23.