Improve doc example
Add buffering iterative file reader
Change the composition of csv_file_to_file

Instead of using i_get_csv_data, Use the buffered file reader
and the unicode csv_reader separately.

Add a function to serial process files in a directory.

During debugging of a user defined function, it can
help to eliminate the complexity of multi-processing.
Define an example csv data cleaner

It changes all the fields of the input data file to title case.
Make example do something more

Sort the data by the second row,  enumerate it, and include
the index in the in the row.
Update doctoring to match functionality
Contrive a more complex batch 'cleaning' function