*8859* Improve article copyright/license affixing

PR for testing and comment; Do not merge.
I don't see how authors would ever be inserted here.  I think this code lost any functionality when $authors was dropped as property of the Article.

After `// Insert authors for this article`, the code goes on to call Submission::getAuthors(), which calls AuthorDAO::getAuthorsBySubmissionId().  Since the Article ID was just created in the insert about, no authors can be assigned that Article ID.  Or am I missing a layer somewhere?

I feel like authors *should* be available as a property of the article, but I'm afraid (without actually investigating) that the scope of that assertion might be pretty massive.  Thoughts?