Merge 'trunk' into 'sybase_mssql'

r6110@mullet (orig r6109):  plu | 2009-05-02 12:11:40 -0700
Failing testcase for using subselect (as_query)
r6111@mullet (orig r6110):  ribasushi | 2009-05-02 17:00:19 -0700
Failing test without immediate fixes go to branches, not to trunk
r6114@mullet (orig r6113):  ribasushi | 2009-05-03 01:23:28 -0700
Bump SQLA ependencies so parenthesis_significant is guaranteed to be there