code: public File getFileFromDeletedFilesNotUpdated(int index) {
      CheckUtilities.checkIntIndexInListRange(deletedFilesNotUpdated, index);
      return deletedFilesNotUpdated.get(index);
    }
docs: Returns the name of the deleted file that is removed locally but not yet removed from
  repository.
  
  @param index
  Index in the list must be positive and less than the number of new files to commit
  @return the name of the file.