Avoid INSERT..SELECT in doArticleDeleteReal()

Avoid INSERT..SELECT in doArticleDeleteReal()

That construct has poor locking characteristics in terms of
auto-inc columns as well as not allowing such inserts concurrently
for statement-based replication. Also, the INSERT..SELECT did not
have an ORDER BY, which could lead to ar_id drift with statement
based replication.

Change-Id: I9396869e474bc082fa6161b60afa3a5247df773b