Fix author list when a book has many author. Was broken for a long time.

author.php

@@ -82,7 +82,7 @@ order by substr (upper (sort), 1, 1)", "substr (upper (sort), 1, 1) as title, co
     }
 
     public static function getAuthorByBookId ($bookId) {
-        $result = parent::getDb ()->prepare('select ' . self::AUTHOR_COLUMNS . ' from authors, books_authors_link
+        $result = parent::getDb ()->prepare('select authors.id as id, authors.name as name, authors.sort as sort from authors, books_authors_link
 where author = authors.id
 and book = ?');
         $result->execute (array ($bookId));