oracle for update + limit, emits bad SQL

[Mike Bayer]

the "For update" gets placed inside a subquery with the ROWNUM stuff on the outside, Oracle doesn't accept this. the rownumn logic will have to move for updates to the outside.

[Mike Bayer]

in 40c7db67b46fac0029f8caf7a53cbceb05a2324d, we fix the syntax error. But in most cases, Oracle still raises ORA-02014, so to a large degree the issue is moot here. But we prefer to make it past the Oracle parser.

[Mike Bayer]

Removing milestone: 0.6.1 (automated comment)