Merge 'subquery' into 'trunk'

diff --combined Changes
index 6adb26f,e061f5b..9bdf1b9
--- 1/Changes
--- 2/Changes
+++ b/Changes
@@@ -1,13 -1,11 +1,15 @@@
  Revision history for DBIx::Class
 +        - Add DBIC_MULTICREATE_DEBUG env var (undocumented, quasi-internal)
 +        - Fix up multi-create to:
 +          - correctly propagate columns loaded during multi-insert of rels
 +          - not try and insert things tagged on via new_related unless required
          - Possible to set locale in IC::DateTime extra => {} config
          - Calling the accessor of a belongs_to when the foreign_key
            was NULL and the row was not stored would unexpectedly fail (groditi)
          - Split sql statements for deploy only if SQLT::Producer returned a scalar
            containing all statements to be executed
+         - Add as_query() for ResultSet and ResultSetColumn. This makes subqueries
+           possible. See the Cookbook for details. (robkinyon, michaelr)
  
  0.08099_06 2009-01-23 07:30:00 (UTC)
          - Allow a scalarref to be supplied to the 'from' resultset attribute