#9 Terminology Agreement

This is my attempt to use consistent terminology for data fields (instead of columns), args and kwargs (instead of options, params, or parameters), and numpy arrays or formatted arrays (instead of numpy.recarrays, which they're not!).

I think this is mostly uncontentious--assuming I didn't mess anything up with my edits--except for one place, where I retained the "cols" description instead of fields particularly when we're talking about corr2, since the config parameters for corr2 are `x_col`, `w_col` etc.