1) Use CREATE TEMPORARY TABLE ... LIKE for MySQL >= 4.1

1) Use CREATE TEMPORARY TABLE ... LIKE for MySQL >= 4.1
and PostgreSQL (untested, but should fix bug 585). Use a
hack for older MySQL versions that doesn't require including
a .sql file.
2) Die gracefully when an article has an invalid title or
already exists in the database.
3) Detect and report duplicate sections in the test file.