List of changes:
- Fixed minor issue with the adding/deleting of authors in the PPSP and
main window (for whatever reason it stopped working, suddenly didn't
like the dummyAuthor. All good now)
- The user can now only enter one test document at a time (before they
could enter multiple ones even though it's not actually supported in
Anonymouth's current state)
- The document viewer in the middle now clears whenever the user deletes
their original test doc (before the preview would remain until a new doc
was added).
- Removing all authors from the Training Docs tree now correctly updates
the doc prep color to red.
- Deleting all documents an author has now correctly updates the doc
prep color to red and also prompts that all authors must have at least
one document before deleting.