*8859* Improve article copyright/license affixing

PR for testing and comment; Do not merge.
ArticleDAO::insertArticle() can't depend on Article::getDefaultCopyrightHolder() here when an author is the copyright holder because:
Article::getDefaultLicenseURL() ->
  Article::_getDefaultLicenseFieldValue() ->
    Submission::getAuthorString() ->
        Submission::getAuthors() ->
            AuthorDAO::getAuthorsBySubmissionId()
requires authors already be attached to the article in the database.