- [feature] Added cte() method to Query,

- [feature] Added cte() method to Query,
invokes common table expression support
from the Core (see below). [ticket:1859]

- [feature] Added support for SQL standard
common table expressions (CTE), allowing
SELECT objects as the CTE source (DML
not yet supported).  This is invoked via
the cte() method on any select() construct.
[ticket:1859]