Switch from CSV to TSV

[cthoyt]

There are a few major issues with CSV files:

1. Commas may pop up inside data, which means cells need to be quoted
2. There are many different flavors of quoting schemes. This is very difficult to convey
3. Commas themselves create a huge amount of noise when reading a CSV document

TSV uses tabs instead of commas and has none of these problems as tabs should not be in the data itself.

I think it should be possible to directly import and export the table through pandas.

[davidlmobley]

This is a good idea; want to do a PR?