Incrementally Return CSV
The first function (ftype_batch) is a view that passes the first part of the CSV filename and a queryset intended to write out to the file. run_batch prepares the HttpResponse for incrementally writing, and write_batch actually writes out the data. The logic in write_batch is custom to what I need done, but as long as the csv writer receives a sequence to write, it should work.
- csv
 - incremental