Change Python word spitting code to process words in order and pick up where it left off if an error occurs

[stephaniereinders]

Is your feature request related to a problem? Please describe.

1. The Python word-splitting code does not process the words within a document in order.
2. If I understood Allie correctly, if the code returns an error on one of the documents and she restarts the code, the code starts from the beginning and reprocesses words or documents that have already been processed.

Describe the solution you'd like

1. Allie would find it quite helpful for her workflow if the words were processed in order.
2. It would be helpful for the code to skip over docs or words that were already processed and saved and start where it left off.

Describe alternatives you've considered
The code works as is, so these changes are not required but they would make Allie's life easier. The alternative that we've considered is not making any changes.